Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - Electra

Pages: 1 2 [3] 4
31
Chronos User Discussion / Accessories! (User designed ones)
« on: September 04, 2017, 03:42:17 AM »
Keep forgetting to put this up.
A week or two ago I made a laser cut 'splash shield' for the camera.  It's made from 3mm acrylic and is designed to protect both the ports on the side, exposing only power and trigger but mostly to keep water out of the front intake vents.  Air is drawn in through the bottom on the left and exhaust it through the top and right.
It was made to be used on a tripod, not sitting directly on a flat surface. And I'm assured that it won't block airflow to any amount that matters.

The idea was just to stop casual splashing, for example, using the camera near a swimming pool, throwing rocks in buckets, waterballons and other places where flying droplets and small splashes are involved. It's not to protect the lens, just stop water from being pulled into the camera by the fan and keep dust out of the side ports.

Everything mounts with 6, M4 bolts/screws/whatever you wish.. If you countersink the holes you can make for quite a clean install. If your extra worried, put some tape over the top between the acrylic and camera, as well as over the SD card slot and microphone(Or even over everything).  The hole in the center is 40mm by about 12mm deep) and fits at least the standard Prime lens and even larger ones I have.  The flatter one should give more clearance. Or you can make the 40mm hole a bit larger on the top plate, up to, say, 45mm or so(Just enough to overlap with the lower mounts).
The side plate is the only tricky bit, it's mirrored amd made to be cut from the back with the two audio ports 1.5mm deep engraves rather than full cuts.

I have other versions that include only the port guard and  just the splash guard that fits tighter to the front(Has only 1 instead of 2 stand-offs and don't use the side connections) that if interested I can post too.  Or even the original .svg with all the messy work. :)

32
Chronos User Discussion / Re: Full user manual is out
« on: August 16, 2017, 07:30:14 AM »
Mechanical drawings! Yes!  Expect laser cut splash shield designs and dust covers in the next few days.
(Was planing this anyway, but now it makes things trivial.)

33
Another tool I've found that may be handy.
https://mkvtoolnix.download/
Found while searching for how to change recorded framerate:
https://askubuntu.com/questions/370692/how-to-change-the-framerate-of-a-video-without-reencoding/547991#547991

As the actual frame-rate is just a number, this is one way to change it to whatever your editor/encoder/preferences likes the best.  I keep forgetting to change 60fps back to 30fps in the camera and my editor can be a bit stupid about overriding. This is one way I've found to change it afterwards.

34
Software Dev / Re: Suggestion: Reverse direction of buffer bar
« on: July 28, 2017, 06:39:55 PM »
A third for left-to-right. Plus it's easier to keep your fingers out of the way if it's along the bottom.

35
Software Dev / Re: Initial feedback
« on: July 28, 2017, 06:38:33 PM »
As I'm not sure where else to add comments, I'll tack them on here.
For the most part the UI is basic but makes sense, requiring only minimal knowledge.
Only thoughts sofar:
  • If you used one of the preset speeds/resolutions, have the drop-down box remember what one it is. Or go blank(or say 'custom') if you change anything.
  • Let the jog wheel control the shutter speed in the main display. I don't think it does anything at the moment.
  • In playback, make jog wheel /toggle/ between fast and slow advance with an on screen indicator of what mode it's in, holding and turning is clumsy.
  • PLEASE add metadata recording. So every shot has the camera's settings somewhere in the exif(or equivlient), so when editing or afterwards you can see what framerate, shutter speed, etc, etc you used.

36
Chronos User Discussion / Re: Chronos 1.4 Footage Thread
« on: July 26, 2017, 03:54:26 AM »
I can finally put some links of my own up here!  The camera is so easy to use! A few quirks, but most of my problems was learning how to manually focus. :)

The current best video. Playing with editing a bit more to show what is happening.
Orange vs. Thing that goes boom:
https://www.youtube.com/watch?v=dJrVUkyg_fQ

The previous attempt. Before I worked out how to add text to the video.
Water into molten lead:
https://www.youtube.com/watch?v=mbPOCCt7cuM

And simple. Pretty. Colorfull pegs being dropped:
https://www.youtube.com/watch?v=KaLEh_JuoUA

37
Software Dev / Re: Software update V0.2
« on: July 26, 2017, 03:42:46 AM »
BNC trigger delay works fine on 0.2 firmware for us.  Both in the low hundreds and high thousands of frames.

38
Software Dev / Re: Software update V0.2
« on: July 25, 2017, 06:15:24 AM »
Faultless upgrade. Quick and simple.
Can't wait for persistent settings, everything else I'll enjoy as they come. :)

39
Chronos User Discussion / Re: Let's talk LENSES!
« on: July 23, 2017, 09:04:14 AM »
Some info on how they work: http://rubenkremer.nl/2013/11/26/focal-reducers-speedbooster-lens-turbo-and-light-cannon/
https://beomagi.blogspot.com.au/2014/01/focal-reducers-on-dslrs-and-light-gain.html
And a bit about them on more conventional cameras:  http://nofilmschool.com/2014/07/cheaper-budget-metabones-speed-booster-excell-1-fotodiox-pro

I did find: http://agenaastro.com/agena-c-cs-mount-focal-reducer.html
There looks to be a whole range for telescopes. Might be worth looking down that path.

Because we'll be doing something non-standard, I'm expecting half research and half trial-and-error to get this working, but unless I've got something very wrong, it should possible.
Depending on the lens/adapters, we may have to find native reducers for our lenses and then something like that c mount one for the final to get past the adapters narrowest point. One thing that might help is that C mount is made for 1" sensors(or close to it) and we have a 2/3" sensor, so even if we loose some light, concentrating what we can use further might still help.

I know there'll be looses in the optics and I'm expecting most bother, but it's too interesting a path to not at least experiment a bit.

40
Chronos User Discussion / Re: Let's talk LENSES!
« on: July 23, 2017, 03:15:33 AM »
I'd have thought that the focal reducer/speed booster would have been more useful because it gives you another F/stop?  Are there such things for C mount or is this going to be Krontech's next custom made accessory? :)
That's why I was looking at them. If you take a lens for a 4/3 or full frame sensor and focus all that light on the 3/4" sensor the Chronos has, it'll give you much better light gathering capabilities, the one thing that your always fighting for with high speed cameras.
Getting second hand glass for much larger sensors is fairly easy due to the SLR market, but a lot of the light is lost using it with the smaller sensor size. It would be nice to get some of it back even if it means quite drastically changing the lens focus length.

41
Chronos User Discussion / Re: Let's talk LENSES!
« on: July 17, 2017, 02:49:42 AM »
My collection is the 2/3"  12mm, F/1,6 Prime that David offered with the kickstarter. (This will be the lens that will stay on the camera when it's packed away.)
* A Secondhand Cosmicar 22-66mm, F/1.8 Zoom 'TV Lens' that should be at least full 2/3" or better frame.
* AU$75 8-50mm F1.4  1/2"  Lens from Aliexpress that is our 'cheap lens' test.
* And currently at a friend's place but promised to me, a "Zenit Photosniper" with a Tair-3AS 300mm f/4.5 lens that I have no idea what it'll be like to use but at least in full sunlight looks like it might work up to about 4000fps.

In 2-3 weeks I should have test footage with the first three up. The last one, I have no idea when I'll actually get it.  I'll update when I have info.
I'm very interested in what other's experiences are too.

42
My guess would be that the camera isn't doing a buffer flush/file-system sync.
Maybe the next version of the firmware should have an 'unount/eject SD card' button or automatic mount/unmount for SD card on save.
Saving a tiny amount of extra footage you can afford to loose might be a quick fix?

But for now, good to know! Keep the SD card in the camera until shut down for now.

43
Chronos User Discussion / Re: Chronos 1.4 Footage Thread
« on: July 09, 2017, 10:13:24 PM »
I'm not a big fan of firearms, however things that can launch corks, ping-pong balls and larger past the speed of sound is simply brilliant.

DerpykV, your going to have to take some more shots with it and an (realtime) overview video.

nik282000, love how you can see the pressure wave build up and the disk break just before the ball touches it.
I'm assuming you've tried it with clear packing tape too? I've used it very well in the past. That with enough lighting, the ball painted black/white and the camera aimed as strait down the barrel as you dare would give give a very interesting shot indeed.

44
And in case you haven't been following this build for a long time. Here is one of David's early ones.
3D printed case, older sensor, bunch of other changes but hey, that looks like a camera we might like to buy if only he'd run a Kickstarter or something.. :)

https://hackaday.com/2015/01/15/tesla500-builds-a-high-speed-video-camera/

Anyone commented on this and now have an order for one?
Or failing that, how many of us found out about this from /before/ the prototypes were sent out across Youtube?

45
Chronos User Discussion / Re: Chronos 1.4 Footage Thread
« on: July 06, 2017, 11:56:15 PM »
Please tell me you'll be putting nice clear video of that up on your channel soon.
That looks super cool.

Pages: 1 2 [3] 4