KronTalk

Chronos => Chronos User Discussion => Topic started by: hydraulicpresschannel on February 05, 2020, 09:05:41 AM

Title: Chronos 2.1 lenses
Post by: hydraulicpresschannel on February 05, 2020, 09:05:41 AM
There was already some discussion about lenses on other topic but I thought that this subject deserves it's own topic. I have been too busy to think about what lens to get and now the camera just arrived and I don't have anything suitable to film with it :D Only lens that I have is my dad's old russian 500mm mirror lens that would be probably something like 2000 mm with the crop factor taken into account. I think I have to do at least one video with the combination still :D

I think I don't want to just use some Nikon glass with always wide open hack so I have to find totally manually controllable lens and it would be probably good to be at least f 2.8

With regular cameras I use quite often prime lenses since there is enough pixels to zoom in on edit when necessary on 4k image but that's not option here so probably have to find zoom lens and it ain't going to cheap with these specs probably :D If anybody has good recommendations those are welcome.
Title: Re: Chronos 2.1 lenses
Post by: hydraulicpresschannel on February 05, 2020, 09:15:01 AM
I found one used lens for sale near. https://kamerastore.com/product/nikon-24-70mm-f2-8-g-ed-n-af-s-nikkor-7/

I think that could be probably pretty good and since it's just f 2.8 no need for any trickery to keep it open. Does anybody know whats the crop factor with Nikon lenses and the mount that comes with the camera?
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on February 05, 2020, 09:31:32 AM
Hi Lauri,
The Lens you linked is Still a "G-Style" Nikon lens, you can see that by the "G" in the Lens name. That means you need to control the Apperture with the Adapter or camera and you still have the problem with the Apperture beeing Closed all the time.
Lenses Without the G in the Name from Nikon have dedicated Apperture-Control Rings. This lens has not.
I think what is intended to be used with this adapter and the camera is actually something like those primes Here (Set of Rokinon Manual Prime Lenses in Nikon mount, with apperture Rings):

https://www.ebay.de/itm/Super-lichtstarkes-walimex-pro-Vollformat-Objektiv-Set-fur-Nikon-14-24-35-50-85/174138211715?hash=item288b723d83:g:2KEAAOSwn~Bd9hfW (https://www.ebay.de/itm/Super-lichtstarkes-walimex-pro-Vollformat-Objektiv-Set-fur-Nikon-14-24-35-50-85/174138211715?hash=item288b723d83:g:2KEAAOSwn~Bd9hfW)
.
Once i got mine i could make and send you an adapter with wich you could control the Apperture, since you are in Finnland. So shipping wont be a problem for me.
.
Or (you have a 3D-Printer) just print this file in the Attachment and use this adapter, which will let you controll the apperture (This is The Adapter i use, also the one shown in the video with the "Hack"):
https://www.ebay.de/itm/Objektiv-Adapter-fr-Nikon-AI-AIS-G-Lens-to-Olympus-Panasonic-MFT-M4-3-M43-Kamera/254307153863?hash=item3b35e337c7:g:iYcAAOSwTUpdNrH0 (https://www.ebay.de/itm/Objektiv-Adapter-fr-Nikon-AI-AIS-G-Lens-to-Olympus-Panasonic-MFT-M4-3-M43-Kamera/254307153863?hash=item3b35e337c7:g:iYcAAOSwTUpdNrH0)

Since nobody did give Feedback on the Functionality of the 3D-Model, you maybe need do change the Thickness to get propper Focus on infinity. If you do so, please upload the changed file for everyone else to use, that would be nice!
Also dont do to crazy stuff with this, since it has no lock, it is just clamped in the 3D-Printed Interchangeable Mount.
I can also give you Plans to build an Metal Adapter on your CNC, if you want, contact me via PM.
Title: Re: Chronos 2.1 lenses
Post by: hydraulicpresschannel on February 05, 2020, 09:54:28 AM
I sent email to that lens store and asked do they have any parts that could do the job of keeping it open. I have way too much things to do so it would be great to just solve this with out starting to design and manufacture parts :D

But the prime lens set is also pretty good option. Those would be quite fast lenses and the price isn't totally crazy.
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on February 05, 2020, 10:03:42 AM
I sent email to that lens store and asked do they have any parts that could do the job of keeping it open. I have way too much things to do so it would be great to just solve this with out starting to design and manufacture parts :D

But the prime lens set is also pretty good option. Those would be quite fast lenses and the price isn't totally crazy.
Yeah, ok, i forgott, that you are also an pretty busy man...
But i also doubt that this lens Store will Have anything usefull for you. if you want THAT lens, with an easy fix for that problem, just get an older version, like the "AF" version (Non-G):
https://www.ebay.de/itm/Sigma-EX-Aspherical-24-70-mm-F-2-8-AF-D-Macro-Objektiv-fur-Nikon/293392214343  (https://www.ebay.de/itm/Sigma-EX-Aspherical-24-70-mm-F-2-8-AF-D-Macro-Objektiv-fur-Nikon/293392214343?hash=item444f89e947:g:ZPkAAOSwPkheAoA4)
This Version of the Lens is quite a bit older and still has an Apperture Ring, so you can control the Apperture with that.
I think, since FullHD is still a rather low resolution to todays 24 and More Megapixel, that the difference in Image Quality shouldnt be that bad... also it can be had for pretty cheap used.
.
For Primes, you could get an old 50mm Nikon Mount Lens with Apperture Ring, they cost very little. Still kinda long focal length, but fast and Cheap!
https://www.ebay.de/itm/Nikon-Nikkor-AF-50-mm-F-1-8-D-AF-Objektiv-neuwertig/164055117540  (https://www.ebay.de/itm/Nikon-Nikkor-AF-50-mm-F-1-8-D-AF-Objektiv-neuwertig/164055117540?epid=100046184&hash=item2632726ee4:g:MKAAAOSwhs1eMcpz)
https://www.ebay.de/itm/Nikon-Lens-Series-E-50-mm-1-1-8-Pancake-Nikon-Analog-Objektiv/143524847929  (https://www.ebay.de/itm/Nikon-Lens-Series-E-50-mm-1-1-8-Pancake-Nikon-Analog-Objektiv/143524847929?hash=item216abf6139:g:EzIAAOSwIM5eOtIm)
Title: Re: Chronos 2.1 lenses
Post by: hydraulicpresschannel on February 07, 2020, 12:59:06 AM
I ended up buying Sigma 18-35mm f/1.8 lens and ordering couple of those fancy adapters that allow to control the aperture (one for color camera and one for my upcoming monochrome camera). I think I am going to buy at least one more lens so I can film with both cameras at the same time but I decide that after I have used this lens for a while.

I think I have to get lot more trigger cables since I have now already 3 cameras and it would be nice to trigger them one-by-one on some situations and from far away.
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on February 07, 2020, 05:44:11 AM
I ended up buying Sigma 18-35mm f/1.8 lens and ordering couple of those fancy adapters that allow to control the aperture (one for color camera and one for my upcoming monochrome camera). I think I am going to buy at least one more lens so I can film with both cameras at the same time but I decide that after I have used this lens for a while.

I think I have to get lot more trigger cables since I have now already 3 cameras and it would be nice to trigger them one-by-one on some situations and from far away.
That is a very good idea in my opinion!That is also the exact thing, i recommended to the User marcus, when he asked me about lenses. Get whatever you think will be a good fit, use it for a while (maybe a month or two, depending on how much you use it), then decide what else to get.the 18-35 does not have a lot of Zoom and is big, fat and Heavy, also somewhat pricey, but still worth it by a lot.You would maybe want to add some Longer Tele Lens or an Ultrawide-Lens..For Lower Resolution, like 800x480px (which you will have to use anyways for the Higher Framerates...) the C-Mount Lens from the 1.4 Chronos should still be useable perfectly fine. At Higher Resolutions, it is very likely that the 12,5-75mm 1.2 C-Mount will not cover the full sensor, and you will end up with an image that has black corners.
Title: Re: Chronos 2.1 lenses
Post by: tesla500 on February 07, 2020, 07:17:45 PM
Here are some lenses I highly recommend. We've been using them for taking promo videos and they work great. All of these lenses have proper built-in manual aperture controls that will work with the included Nikon-C adapter.

Nikon ED AF-S Nikkor 28-70mm 1:2.8 D (https://www.kenrockwell.com/nikon/2870afs.htm)
Best general purpose zoom lens we've used so far, equivalent to 14-35mm on the Chronos 1.4. Out of production but readily available on the used market.

Nikon 80-200mm f/2.8 (https://www.kenrockwell.com/nikon/80200.htm)
Longer general purpose zoom. Equivalent to 40-100mm on the Chronos 1.4. If you're used to the zoom range of the Computar 12.5-75mm on the 1.4, the combination of this lens and the one above will duplicate that functionality, with a bit more zoom to boot.

For prime lenses, Rokinon makes a nice series of prime lenses (https://www.rokinon.com/lenses/digital-photo-lenses/searchby/mount/nikon-ae) and Cine lenses (https://www.rokinon.com/lenses/cine-ds-lenses/searchby/mount/nikon) with manual aperture controls, any of these will suit the 2.1-HD very well. They have wider apertures than the zooms, especially in the ~35-70mm range. The pricing is very reasonable, most are in the $400-600 range

Here are more zoom lenses (http://lenshero.com/lenses/zoom-f2.8-lens-by-Nikon) with f/2.8 or wider apertures. We havn't tried these ourselves, but as long as they have manual apertures they will work fine.

The 2.1-HD has a 4/3" image sensor, so the crop factor is 2:1 from full frame. You can use the Computar 12.5-75mm on the 2.1 up to about 1024x768 resolution or so (about half of full res) before it starts to vignette.
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on February 08, 2020, 02:24:49 AM
Here are some lenses I highly recommend. We've been using them for taking promo videos and they work great. All of these lenses have proper built-in manual aperture controls that will work with the included Nikon-C adapter.

Nikon ED AF-S Nikkor 28-70mm 1:2.8 D (https://www.kenrockwell.com/nikon/2870afs.htm)
Best general purpose zoom lens we've used so far, equivalent to 14-35mm on the Chronos 1.4. Out of production but readily available on the used market.

Nikon 80-200mm f/2.8 (https://www.kenrockwell.com/nikon/80200.htm)
Longer general purpose zoom. Equivalent to 40-100mm on the Chronos 1.4. If you're used to the zoom range of the Computar 12.5-75mm on the 1.4, the combination of this lens and the one above will duplicate that functionality, with a bit more zoom to boot.

For prime lenses, Rokinon makes a nice series of prime lenses (https://www.rokinon.com/lenses/digital-photo-lenses/searchby/mount/nikon-ae) and Cine lenses (https://www.rokinon.com/lenses/cine-ds-lenses/searchby/mount/nikon) with manual aperture controls, any of these will suit the 2.1-HD very well. They have wider apertures than the zooms, especially in the ~35-70mm range. The pricing is very reasonable, most are in the $400-600 range

Here are more zoom lenses (http://lenshero.com/lenses/zoom-f2.8-lens-by-Nikon) with f/2.8 or wider apertures. We havn't tried these ourselves, but as long as they have manual apertures they will work fine.

The 2.1-HD has a 4/3" image sensor, so the crop factor is 2:1 from full frame. You can use the Computar 12.5-75mm on the 2.1 up to about 1024x768 resolution or so (about half of full res) before it starts to vignette.
So, was the 2.1 Chronos Demo Reel shot on those?.
Because, if it was shot entirely on f/2.8, in such rather dimmly lit (For Highspeed) Scenes, i would be seriously impressed..
I did in fact expect, that this was shot on at least f/2 or even f/1.4 Lenses (For example Primes or something)!.
Cant wait, till i get mine, to do a Low-Light test, if this turns out to be the case, cause this camera should allow for some rather Low-Light shooting then!
Title: Re: Chronos 2.1 lenses
Post by: hydraulicpresschannel on February 11, 2020, 12:00:43 AM
I got the Sigma 18-35mm f/1.8 installed to the camera and it works really well. I think I am going to get some video out at latest on Sunday with the new camera.

The adapter ring with aperture control works really well. The lens is also really nice to use, focus is really smooth and even if the focus plane is quite shallow the focus peeking on the camera makes it easy to focus. I think I am going to probably get the SIGMA 50-100MM F/1.8 for second lens so I can use two cameras at the same time and having longer lens is handy for really stupid stuff  ;D
Title: Re: Chronos 2.1 lenses
Post by: marcus on February 11, 2020, 01:46:29 AM
I got the Sigma 18-35mm f/1.8 installed to the camera and it works really well. I think I am going to get some video out at latest on Sunday with the new camera.

The adapter ring with aperture control works really well. The lens is also really nice to use, focus is really smooth and even if the focus plane is quite shallow the focus peeking on the camera makes it easy to focus. I think I am going to probably get the SIGMA 50-100MM F/1.8 for second lens so I can use two cameras at the same time and having longer lens is handy for really stupid stuff  ;D

Good to know it works well! Thanks for update
Title: Re: Chronos 2.1 lenses
Post by: Buddlich on February 12, 2020, 02:18:44 PM
Since both, the 1.4 and the 2.1 have the same casing I want to tell you my "problem" here in this thread:

In the moment I use this C mount to Canon Adapter https://www.amazon.de/gp/product/B00VIVXL2E/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I'm using some quite heavy lenses on my Chronos. Having this super tiny C mount hole expanding to the Canon Adapter with this "giant" lens on it, it looks very worrying from a structural point of view.

Do you know if there are more "stable" adapters on the market... maybe some which use the for screw holes next to the lens hole??

I just know this from my Moravian Astro Camera... they have some Canon adapters that can be screwt directly to the casing ...

Or can you just prove me, that this tiny c mount thread is more than enough to hold a big 1kg lens on it's own? :D
Title: Re: Chronos 2.1 lenses
Post by: skronstein on February 12, 2020, 04:17:02 PM
Or can you just prove me, that this tiny c mount thread is more than enough to hold a big 1kg lens on it's own? :D

The Nikon 80-200mm f/2.8 is 1275g and is one of the lenses that tesla500 recommended above, so others over 1k would be ok too.
Title: Re: Chronos 2.1 lenses
Post by: tesla500 on February 12, 2020, 04:45:30 PM
It may look rather weak but the C mount is quite strong. As Simon said I've used large 1kg+ lenses without issue, including dropping a camera with a ~900g F mount lens attached about 1.2m onto concrete, and the lens mount held up just fine.

Obviously, don't do anything remotely high-G with lenses like this, but for general use they will be just fine.


Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on February 13, 2020, 01:35:18 PM
Since both, the 1.4 and the 2.1 have the same casing I want to tell you my "problem" here in this thread:

In the moment I use this C mount to Canon Adapter https://www.amazon.de/gp/product/B00VIVXL2E/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 (https://www.amazon.de/gp/product/B00VIVXL2E/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1)

I'm using some quite heavy lenses on my Chronos. Having this super tiny C mount hole expanding to the Canon Adapter with this "giant" lens on it, it looks very worrying from a structural point of view.

Do you know if there are more "stable" adapters on the market... maybe some which use the for screw holes next to the lens hole??

I just know this from my Moravian Astro Camera... they have some Canon adapters that can be screwt directly to the casing ...

Or can you just prove me, that this tiny c mount thread is more than enough to hold a big 1kg lens on it's own? :D

 So, third try then...
 I tried to Upload an image of an Heavy C-Mount Lens, but since i now wrote an Lenghty Post twice, and ended up with an error-Page when trying to preview (with my text all gone...), i will just use Links now...
 .
 https://www.engineeringtoolbox.com/metric-bolts-minimum-ultimate-tensile-proof-loads-d_2026.html (https://www.engineeringtoolbox.com/metric-bolts-minimum-ultimate-tensile-proof-loads-d_2026.html) .
Here is an List with proof Load Rating of different Bolt Sizes. C-Mount is Basically just an 25,4mm (1") 32TPI Fine Screw Thread, so, even given the Fact, that it is Hollow on the inside, it should still be able to hold a lot of weight (easily 50~100kg or even way more according to this link).  This is for Steel Bolts though, smaller/ Cheaper lenses and adapters are Aluminum, more Premium Ones or Very big/ Heavy ones are made from Stainless Steel..
 I had an 16-160mm 1.6 Tarcus Brand C-Mount Lens once, dont have it anymore, this was a Very heavy and big lens. Propably over 2kg, and never had any problems with the C-Mount.Since i can somehow not post the image right now because of error pages, here is a link to the Fattest and Heaviest vintage C-Mount Lenses i could find for the Moment (Most of them Wont cover the Chronos 2.1 Sensor, keep that in mind!):.This one Has 5lbs Weight!:  https://www.ebay.de/itm/SUPER-16-ANGENIEUX-ZOOM-SUPERSPEED-1-9-15-150MM-LENS-C-MOUNT-BMPCC-MOVIE-CAMERA/291640944665
 (https://www.ebay.de/itm/SUPER-16-ANGENIEUX-ZOOM-SUPERSPEED-1-9-15-150MM-LENS-C-MOUNT-BMPCC-MOVIE-CAMERA/291640944665?hash=item43e727a819:g:0C0AAOSwHnFV5eov.https://www.ebay.de/itm/Angenieux-10-150mm-T-2-3-C-mount-S16-Cooke-BMPC-Red-Alexa/184071216674?hash=item2adb7fde22:g:UrIAAOSwS1Jd6RPC.https://www.ebay.de/itm/Schneider-Kreuznach-Tele-Variogon-1-4-80-240mm-C-Mount-w-hood-and-case/264631424263?hash=item3d9d431507:g:EQwAAOSwz5peQz91...I) https://www.ebay.de/itm/Angenieux-10-150mm-T-2-3-C-mount-S16-Cooke-BMPC-Red-Alexa/184071216674
 (https://www.ebay.de/itm/SUPER-16-ANGENIEUX-ZOOM-SUPERSPEED-1-9-15-150MM-LENS-C-MOUNT-BMPCC-MOVIE-CAMERA/291640944665?hash=item43e727a819:g:0C0AAOSwHnFV5eov.https://www.ebay.de/itm/Angenieux-10-150mm-T-2-3-C-mount-S16-Cooke-BMPC-Red-Alexa/184071216674?hash=item2adb7fde22:g:UrIAAOSwS1Jd6RPC.https://www.ebay.de/itm/Schneider-Kreuznach-Tele-Variogon-1-4-80-240mm-C-Mount-w-hood-and-case/264631424263?hash=item3d9d431507:g:EQwAAOSwz5peQz91...I) https://www.ebay.de/itm/Schneider-Kreuznach-Tele-Variogon-1-4-80-240mm-C-Mount-w-hood-and-case/264631424263  (https://www.ebay.de/itm/SUPER-16-ANGENIEUX-ZOOM-SUPERSPEED-1-9-15-150MM-LENS-C-MOUNT-BMPCC-MOVIE-CAMERA/291640944665?hash=item43e727a819:g:0C0AAOSwHnFV5eov.https://www.ebay.de/itm/Angenieux-10-150mm-T-2-3-C-mount-S16-Cooke-BMPC-Red-Alexa/184071216674?hash=item2adb7fde22:g:UrIAAOSwS1Jd6RPC.https://www.ebay.de/itm/Schneider-Kreuznach-Tele-Variogon-1-4-80-240mm-C-Mount-w-hood-and-case/264631424263?hash=item3d9d431507:g:EQwAAOSwz5peQz91...I)
 . 
 I can just agree, what tesla500 said, dont do way too crazy Stuff including high-G and Physical Shock with it, and you should be fine, mounting about anything to it you would propably ever want to mount.
 However, most bigger and heavier Lenses Do come with an Tripod Mount built in, if it has one, use it. Also, if your Lens is heavier than your Camera, Handle, Hold, Lift, and Mount the Whole Rig by the Lens.
 This is just an general Reccomendation for any camera System, not just for C-Mount but also applies here.
 .
 .
 Yet anothe Point i want to make:
 https://en.wikipedia.org/wiki/Flange_focal_distance
 (https://en.wikipedia.org/wiki/Flange_focal_distance.Look) Look at this list of Lens mounts, C-Mount is now almost 100 Years old! and Thats for a reason.
 It did stand the Test of time, and has proofen it self.
 This is the Oldest Lensmount, for which new Lenses Are Produced up to this day, and no end in sight.
 Again, As tesla500 Said, it might look not like much and too small, but it is quite the serious Mount!
 .
 I am also pretty Happy, that they went with this combination of the CS-Mount and the four-Hole Box-Mount, because, unless about any other Camera of this kind, it allows you to mount about every lens ever made, including almost any Mirrorless Lenses known today (Electronic Focus-By-wire Style Lenses are a problem, but i mean just beeing able to physicaly mount the Lens itself while maintaining propper Flange Distance is quite a big thing!).
 .
 .
 If you still feel the Need to mount the Lens more sturdily, search the internet for those Rod-Type Supports they use in Professional Cinema.
 Supports for different size Cameras and Lenses Are Available, if you search a bit, also Rods at different Lenght.
 Even More Stable/ Serious Solution would be to use an Adapter which uses the four M4-Hole-Mount on the Front of the Chronos Camera Body.
 I and a few other People on the Forum can Make one, if you still feel the need, or just find sombody to make one for you, for example a local Machining Shop. Its still just a Pice of Metal at the end of the Day.
 .
 EVEN MORE Sturdy would be to just Modify the Lens and get it Rehoused or get the Mount itself changed to just mount directly to the four Holes on the Chronos, this way you dont have anything between the Lens itself and the Camera.
 If that is still not enough, also support it by Some Kind of Cage (Highly Required, if you for some Reason end up needing to use big and/ or heavy Lenses in high-G /Vibration/ Physical Shock situations)
 .
 .
 .
 Hope this, as requested, was enough to proof to you that C-Mount will be able to handle Lenses of 1kg and beyond just fine. Maybe dont use your Camera Rig as An Hammer or as a Mounting Point for your Heavy Lifting Equipment, but everything else should be fine  :)
 .
 .
 #EDIT#: Reformating of the Post to make it easier Readable, Text itself remains unchanged. Also finally Added the image of the 16-160mm Lens
 
Title: Re: Chronos 2.1 lenses
Post by: hydraulicpresschannel on February 13, 2020, 01:42:56 PM
The sigma 50-100 f1.8 is 1.5kg and it seems to be just fine. Only problem is that the tiny adapter thing before the c -> to Nikon adapter gets really tight to Nikon adapter and you have to use somekind of pliers to get it free  ;D But the 50-100 mm lens has already thread for tripod on the lens it self so it's bit more balanced when mounted from there.
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on February 13, 2020, 01:43:47 PM
Sorry, Links seem to have merged together in the Above post from me, and i somehow also cant modify change the Post.If you want to look at the Links, just Remove the dots, which are too much, and whatever also merged into it.The Links to the Heavy Lenses are three Links, which now somehow merged into one big mess, even though i left two lines empty between each link.Also the Text is not very readable, because everything now is just without all the empty lines i put into it...
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on February 13, 2020, 01:48:50 PM
The sigma 50-100 f1.8 is 1.5kg and it seems to be just fine. Only problem is that the tiny adapter thing before the c -> to Nikon adapter gets really tight to Nikon adapter and you have to use somekind of pliers to get it free  ;D But the 50-100 mm lens has already thread for tripod on the lens it self so it's bit more balanced when mounted from there.
What you got with the Camera are the cheap Aluminium 5mm-C-Mount Spacers. There are Higher Quality ones made from Stainless steel, but those are rather rare, more expensive and hard to find. Those are also made with better Tollerances, so they wont "bite" so badly into the other things Screwd onto it..And Yeah, as i said, if it has an Tripod mount, i would highly reccomend using it. The 50-100 sigma is really a Fat Lens. Nice to hear that you also got that now  ;) .I expect some cinematic Footage incomming then.
Title: Re: Chronos 2.1 lenses
Post by: Buddlich on February 16, 2020, 07:04:48 AM
Okay, okay thank you!
I think those stories are prove enough :)
Title: Re: Chronos 2.1 lenses
Post by: SergeyKashin on October 03, 2020, 06:29:08 AM
so I bought a Sigma 18-35 Nikon lens. And I ran into a problem, the standard adapter that comes with the camera does not allow me to focus to infinity at 18mm, but at 35mm I can focus to infinity. When installing the ring that comes with the kit at 18mm I also can't focus to infinity and now at 35mm I can't focus to infinity either
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on October 03, 2020, 06:56:04 AM
so I bought a Sigma 18-35 Nikon lens. And I ran into a problem, the standard adapter that comes with the camera does not allow me to focus to infinity at 18mm, but at 35mm I can focus to infinity. When installing the ring that comes with the kit at 18mm I also can't focus to infinity and now at 35mm I can't focus to infinity either
Try adjusting the backfocus of the Chronos, there are tutorials available on the website.
 If you cant set focus to infinity, the Backfocus distance is to long, you need to Screw the Silver Mount part in further into the Camera to make it shorter.
 Adjust slowly untill focus on infinity is possible for both Zoom Setting, then your Backfocus should be set propperly.
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on November 09, 2020, 01:23:18 PM
Dont mind me, just leaving this image of an Old DLP Projection Lens on a Speedbooster mounted to my 2.1 here... (its actually a pretty good lens). Feel free to also post images of your (weird) lenses/ Setups.
Title: Re: Chronos 2.1 lenses
Post by: nik282000 on November 09, 2020, 02:18:05 PM
It's a 1.4, but how about a microscope mount?

Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on November 10, 2020, 07:11:48 AM
Also, while we are here, has anyone yet tried to build a Tilt-Shift Adapter for any SLR-Lenses? Was thinking about something like this since way bevore i even ordered mine, but untill now never got around to do it (and propably also wont do it in near future). But it should be easily possible to build an adapter like this, since The Flange Distance of the Chronos is THAT short, lot of room for an fancy adapter like that. Also sensor is only 4/3", so Image Circle of Full-Frame Lenses is big enough for quite a bit of movements. Also pretty sure someone will be able to make one on an 3D-Printer if they wanted to, not that difficult to do, if you know what to do, or even Cardboard and Glue, if you are patient enough....
Title: Re: Chronos 2.1 lenses
Post by: Fritzhs on December 01, 2020, 08:23:17 PM
Could people please list some lens they use that don't vignette with the 2.1    Especially Canon mount or C mount type that might be available on ebay.  TIA.
Title: Re: Chronos 2.1 lenses
Post by: chrissie_c on December 02, 2020, 02:02:00 AM
Could people please list some lens they use that don't vignette with the 2.1    Especially Canon mount or C mount type that might be available on ebay.  TIA.

I'm just buying old Nikon lenses. There are loads available on eBay (I even got one really cheap cos the autofocus was broken!).
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on December 02, 2020, 03:37:32 AM
Could people please list some lens they use that don't vignette with the 2.1    Especially Canon mount or C mount type that might be available on ebay.  TIA.

 I owned quite a bunch of lenses and got to play with loads more. And from my experience, almost all Lenses With an Focal Lenght shorter than 50mm in terms Of C-Mount lenses Will Show Vignetting on the Really Large Chronos Sensor. Also in General stay away from C-Mount Zooms for use on the 2.1 (there are some Zooms that will work well on the 1.4 but since you ask about vignette, i assume you want to use it on the 2.1 at full Resolution...), they will all vignett, some of them Really badly. Lenses of 50mm and longer Longer are usually good to use on bigger Sensors, like the Chronos one, and there are also a bunch of 25mm C-Mount Lenses that will show only little Vignett on the 2.1. Stuff like 16mm focal Lenght C-Mounts usualy show pretty heavy vignetting, and there are a few lenses that are even wider than that, but its rare to find some, that will propperly cover such a large sensor.
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 C-Mount Lenses can work well for you, but For a sensor like this, especialy if you are after Image Quality for cheap, i would look after broken Bigger Format lenses (if you are able to fix them or know whatever is broken wont matter for your use on the 2.1), totally agree with chrissie_c on that question.
 I myself got an Sigma AF 24-70mm 2.8; an Nikkor AF-S 70-200mm 2.8; an 100-500 Lens of a brand i cant remember right now, its pretty decent; an 0,64x Metabones Speedbooster and an Teleconverter for less than 350€ for all of it. They where all bought from different sellers and i had to do quite a bit of Lens hunting over the term of half a year to find those as cheap, but they are Really worth it and Image Quality is on point for those. All of those where broken to some degree, the Sigma one was literally broken in half (put some work into it and got it working again), thats why i got them so cheap. That is for Nikon Mount however, i dont know about the Canon Lenses, could lead to some Problems with the Apperture Control with broken Lenses. Great thing about The Nikon Glass is that almost everything can be done without the Electronics inside, so easier repair.
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 I personally still use my C-Mount glass like 60-70% of the Time on the Chronos, just because i got way more (and better) lenses for C-Mount right now for most usecases and because they are usually just way less bulky for Macro and such.
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 If you are still interrested in C-Mount lens options, it would really help if you could provide some more info about what kind of Focal Length or usecase you are approximately looking to use them for, would make Reccomendations a lot easier.
 
Title: Re: Chronos 2.1 lenses
Post by: Fritzhs on December 02, 2020, 08:21:19 AM
I'm interested in hummingbird video (and I'm sure I'll find other things to slow down). For photography I have Canon gear, and my main lens for hummingbirds is the CANON EF 100-400MM F/4.5-5.6L IS II USM. My 2.1 with a Canon adapter won't be arriving til like February, so I have plenty of time to think about lens. Your help is appreciated.
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on January 25, 2021, 12:45:50 PM
This is still some Work in Progress, but here is some Images from fitting up a Vintage made Contax-Style Rangefinder Mount to the 2.1 to finally use a bunch of old Russian Rangefinder Lenses from my Collection with the Camera. Its a crazy tight fit, as the 35mm Lens protrudes so far into the Mount, it actually will protrude into the Actual Camera body, and has a rather sizeable Rear Element, which will just ever so barely fit into there, like 1,5mm more in diameter and it would hit the Body itself. Adapter is designed to allow the maximal possible amount of Airflow for the Camera, considering the Mount still has to fit into there.
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on March 10, 2021, 08:47:37 AM
Finally finished the Rangefinder-Mount for my 2.1, here are some Images with lenses. I Skeletonized it as far as possible and removed all material that wasnt needed, where possible, to save on weight, allow for better access to the Mounting Screws for faster Mounting/ Removal of the Adapter, and to reduce the bulk generally. Final adapter assembly weight is only 119g, which is pretty good considering the original Contax mount part of the Adapter is almost completely made from Solid Brass. The Screws i use are Stainless and add another 22g. For anyone interrested in buying the Same Screws:
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 https://www.ebay.de/itm/4-Stuck-Silber-M4x10mm-Gewinde-304-Edelstahl-Randel-Randelschrauben/284085269100?hash=item4224cd326c:g:NzsAAOSwCpxftLSj (https://www.ebay.de/itm/4-Stuck-Silber-M4x10mm-Gewinde-304-Edelstahl-Randel-Randelschrauben/284085269100?hash=item4224cd326c:g:NzsAAOSwCpxftLSj)
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 The Lenses weight ranges from 121g (the 35mm Lens) to 285g (the 135mm Lens).
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on March 10, 2021, 09:11:41 AM
The mount was Taken from an Old Soviet KIEV Camera, as well as the Lenses. I wanted to keep the Mount Part of the Camera in as much of an untouched state as possible, and only removed a little material where it was unavoidable, otherwise the Overall adapter could have been a little bit smaller.
 Overally a very nice Kit of vintage lenses, which gives a really high Quality Vintage Look (those Lenses are Russian copies of early German Leitz/ Leica Optics, but usualy WAY Cheaper to get, bought all of this for like 30 to 40€, dont quite remember anymore, however the Mount will ofc also take Leitz brand lenses...). And those Lenses are SHARP. The 50mm has quite flat color rendition (which i like), but gains some Contrast when stopped down a bit. The 35mm has surprising amount of contrast considering its age, just a outstanding lens. The 135mm is a very solid lens also in terms of image Quality. Seems to be at least as sharp as the 35mm, as far as i was able to test it, and also has a bit of a softer and flater color rendition than the usual modern lenses.
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 Hacked together a Adapter for Sony-E-Mount when i got those, and went to a local Camera store to try them on an α7R III just for Kicks, and even on that sensor fully Zoomed in, it was still as sharp as can be (except for the 50mm wide open untill like f/5.6 or /8, where it also gets as sharp as the sensor can even capture... Hardly noticeable on lower resolution Sensors). Truly impressive for lenses of that age.
 .
 Nice and compact In Size, but sadly not the fastest apperture Lenses ever (35/2.8  50/2  135/4), but still reasonable for outdoor Lighting, where you would stop down anyways to get at least some depth of field.
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on March 10, 2021, 10:56:59 AM
Next up are propper Adapters for MFT-Mount, Nikon1-Mount, Pentax 110, Sony-E-Mount, and an Advanced C-Mount Adapter. MFT and N1 Adapter are allready beeing worked on, the others are so far just blueprints in my head. For Lens Adapter i usualy prefer to use Original Mounts from Brand Cameras over using Metal mounts from those Cheap Extention tubes where ever possible, as finish and fit on the Original Brand Camera Body Mounts is usually worlds better than on the Tube ones. The Cheap Mounts from those Extention tubes are still far better than any Plastic Mounts, but as they are Cheaply made and still have to fit a wide Variety of Lenses and Third-Party adapters, the Makers seem to prefer a rather loose fit on those, to avoid Lenses or adapters not beeing able to be mounted at all. This however makes them Less precise and they sometimes even have Some Play in them, which is just annoying.
Title: Re: Chronos 2.1 lenses
Post by: kiyoung6475 on March 11, 2021, 05:17:29 PM
I ended up buying Sigma 18-35mm f/1.8 lens and ordering couple of those fancy adapters that allow to control the aperture (one for color camera and one for my upcoming monochrome camera). I think I am going to buy at least one more lens so I can film with both cameras at the same time but I decide that after I have used this lens for a while.

I think I have to get lot more trigger cables since I have now already 3 cameras and it would be nice to trigger them one-by-one on some situations and from far away.

Hi,  I got the same lense as you.  Where can I get adapters that allow to control the aperture? 

Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on March 11, 2021, 05:28:27 PM
http://forum.krontech.ca/index.php?topic=544.msg3455#msg3455
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 Look at this Post from a while back, the Adapter i Linked there and any other Nikon G-Style Adapter from another Brand will work for Nikon Lenses without Aperture Ring.
 For Canon Mount Lenses its not really easy to control the aperture without an Canon Brand Camera.
Title: Re: Chronos 2.1 lenses
Post by: Nikon1 on March 11, 2021, 05:31:38 PM
If you are Brave (or very Desperate) you can also use this sketchy trick with Nikon G-Style Lenses:
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 https://forum.krontech.ca/index.php?topic=516.msg2836#msg2836