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Messages - Dan Kanes

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Chronos User Discussion / Re: Chronos 1.4C 16GB Color for Sale
« on: March 02, 2019, 10:30:01 AM »
Sold !

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Chronos User Discussion / Re: Chronos 1.4C 16GB Color for Sale
« on: February 08, 2019, 08:45:11 AM »
Price drop for quick sale:

$2500

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Chronos User Discussion / Chronos 1.4C 16GB Color for Sale
« on: February 03, 2019, 09:43:10 AM »
Very lightly used Chronos 1.4C 16GB Color unit.

Includes Battery, AC Adapter.

Lists for $3400 on the Kron-Store.

Asking $3000 with free shipping in continental USA.

Will throw in some extras like an EF mount adapter for it, and an SD card or two.

Please email : mrpolaroid@gmail.com


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Software Dev / Re: Chronos V0.3.1 Beta
« on: October 01, 2018, 08:51:03 AM »
Added feedback:

saving TIFFs or CinemaDNG to USB Drive results in zero byte files, and the unprompted ejection of the USB media.

both seem to work fine for me to SD Card at the moment.

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Software Dev / Re: Chronos V0.3.1 Beta
« on: September 30, 2018, 08:49:10 PM »
This is AWESOME!

Three crazy questions for you:

1. On your next camera can you have the main ram be based on intel Optane... Look how cheap these are:
https://amzn.to/2QlmOJ5

2. What can I do to speed up saving exports ? like will it be faster to save over Gig-E? Is ESATA working ?

3. I'm getting arouns 1fps saving to a USB 3.0 stick... does that sound right?

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Software Dev / Re: Software Roadmap - 0.3.1, 0.4.x, etc.
« on: September 19, 2018, 11:17:22 AM »
Where does onboard Cinema DNG Raw recording fit into this schedule?

Might be interesting to look at the new BlackMagic Raw format as a next-tier / next gen codec option.

thanks!

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Chronos User Discussion / Re: Video Clarity?
« on: September 29, 2017, 03:02:07 PM »
To add to the above discussion - lighting plays a critical role in getting something that has perceived sharpness.

Furthermore, once CinemaDNG raw frame sequences are available we should have more end user control over color correction, noise reduction, and encode using software like Davinci Resolve - which is free in its most basic version.

When DNG sequences are available I'll do a tutorial on my approach to lighting and color correction with the camera. It's an amazing camera, but you have to "know the ropes" as it is certainly very different than shooting high speed stills, or normal motion for instance.

David could probably add to this discussion - but there are several "blocks" to a system like this camera:

1. Sensor
2. Capture buffer (raw image sequence in temporary ram)
3. Recording - output - Encoder or image file "saver" - encoding can have an effect on image quality, perceived detail, color detail etc. Currently using a good quality H.264 encoder.

Personally, I'd be excited for all intra frame h.264 encoding with very high bit rate in addition to Cinema DNG raw sequences if it's possible.

I think when we have HDMI out working there will be a lot more footage captured in focus too as it will be easier to see on a large, sharp 1080P monitor for critical focus adjustment. Peaking which already exists in camera can help nail focus too.


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Chronos User Discussion / Re: Let's talk LENSES!
« on: July 21, 2017, 07:35:11 PM »
Sorry , no.

Crop factor is a bad idea that confuses people about how lenses work.

What he was saying is you need a 50mm lens made for a 2/3" sensor, and that a 50mm lens for a 2/3" sensor would have a different field of view than a 50mm lens made for a 35mm sensor.

Go get a 50mm 16mm format lens, a 50mm 35mm lens, and a 50mm 2/3" lens - they will all provide the same field of view on the Chronos - because they are ALL 50MM LENSES.

Now, your understanding of effective crop factor is sort of an okay way to translate concepts - but you get into a real shitstorm when you realize there are a lot of 35mm formats and you start making decisions about a shot size on incorrect understandings of how lenses function.

It's better to think in "wide, normal, and telephoto" terms if you're just starting out.

A wide on the Chronos could be anywhere from 6mm to 12mm pretty much.

A medium on the Chronos would be 16 , 25 or 35 (with 35 being pretty long actually)

Telephoto could be a 50 and above on Chronos.

On a 36x24 film format a 50mm is a "medium"

And on a super-35mm motion format a 35 is pretty much "medium"

You could try learning with this whole crop factor BS that photogs often lean heavily on, but if you want to learn the more scientific way that won't leave you with incorrect assumptions - watch the Abelcine video with mitch gross that I posted.

I hate crop factor because it always confuses people new to motion imaging and is akin to trying to translate every word in a foreign language before learning a native language.


A 50mm lens made for a 35mm camera will offer the same field of view as a 50mm lens made for 2/3" or 16mm.

Actually, no, the "A lens is a lens is a lens, and it doesn’t know what size sensor or film gate is placed behind it." is exactly why we have the crop factor. Please see https://photographylife.com/what-is-crop-factor and https://www.bhphotovideo.com/explora/photography/tips-and-solutions/understanding-crop-factor and https://en.wikipedia.org/wiki/Crop_factor

This means that for our 2/3" sensor the crop factor is almost 4, so a 50 mm lens on 2/3" sensor will have the same effect as a 200 mm lens on a 35 mm sensor, and what ExaltedDuck said is spot on (except the reference sensor isn't 4/3" but 35 mm).

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Chronos User Discussion / Re: Let's talk LENSES!
« on: July 20, 2017, 04:44:23 PM »
(a 50mm focal length lens for 16mm film frame should produce an image like a 58mm focal length lens on a 2/3" sensor).  Super-16 is pretty reasonable as well (a 50mm would behave like a 66mm).  Some good info is here and here.  I've been trying to think about the physics of it and while I think I kind of understand how the mismatch alters the field depth to behave like a different f-stop, I am inclined to believe this wouldn't have much impact on the light gathering performance. (if a 4/3" 50 mm f/2 lens is on a 2/3" sensor, we can expect it produce an image framed like 100 mm lens with the field depth of an f/4 aperture but I *think* it would provide the same contrast and brightness as though it were still on a 4/3" sensor at f/2. If anyone knows better, please, by all means, correct me. :) )

A lens's focal length is a different way of describing its Magnification effect.

A 50mm lens made for a 35mm camera will offer the same field of view as a 50mm lens made for 2/3" or 16mm.l [FOR A GIVEN SENSOR SIZE]

The angle of view is sensor dependent.

There are other factors that affect usability / quality of image - such as vignetting if the elements or element holders are not appropriatelt sized for the format.

This should help you understand :

http://blog.abelcine.com/2010/05/14/a-lens-is-a-lens-is-a-lens/


https://youtu.be/ZF4GSMw1CeQ

Personally I'm interested in applying a Focal Reducer to the Chronos to see what we can get out of it.

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