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Messages - rdemyan

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Chronos User Discussion / Re: Recording Frames per second and playback
« on: August 03, 2022, 11:29:43 AM »
You are correct.  The problem was with the editing software. I'm using AShampoo Video Optimizer Pro 2 (perhaps you know the software since the company is based in Germany).  I had unknowingly changed some of the settings and that caused the problem.  Problem solved. Thanks.

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Chronos User Discussion / Recording Frames per second and playback
« on: August 02, 2022, 09:40:25 PM »
I am recording the movement of particles using the Chronos 2.1.  I need to determine the velocity.  I set the 2.1 to record at 640 x 96 which means the recording frame rate was 24,046 FPS.  But when I try to measure the movement of the particles frame by frame I'm getting velocities that I know are too high (there is a ruler in the frames).  I've recorded before at 24,046 FPS and not had a problem.

The only thing that I think I did differently was I reviewed the footage on the Chronos 2.1 before saving.  This time I set the playback FPS on the Chronos 2.1 to 25 instead of 60. I then saved the footage with the playback FPS still at 25.  Does that affect the time differential between frames?  The time differential between frames should be 1/24,046 or about 41.6 microseconds.  This time differential is in the denominator when calculating the velocity.  It is critical to calculating the correct results.

The only other thing I can think of is that the Chronos was on for a couple of hours including  an hour where I was off doing something else, but I left the camera on.  Does the FPS degrade if the Chronos gets hot or is on too long.  I don't think it was hot, but I didn't really check.  It didn't feel hot when my experiment was over and I put the Chronos away.

On the datasheets, why does Krontech list the FPS as "Max FPS"?

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Chronos User Discussion / Set Chronos 2.1 clock
« on: July 07, 2022, 01:12:43 PM »
The save times of the videos recorded with my Chronos 2.1 are not the actual times.  They seem to be behind by around 25 - 28 minutes.  I guess that's because the Chronos clock is off??  How can I set the clock on my Chronos?  It's a real pain to try and match up the save time with the time I record manually based on my computer clock.

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Chronos User Discussion / Re: Software for measuring velocity
« on: May 18, 2022, 07:50:20 PM »
I'm currently testing a free software program named "Tracker".

https://physlets.org/tracker/

It might do the trick, but I wish it had more features.

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Chronos User Discussion / Re: Software for measuring velocity
« on: May 17, 2022, 08:43:02 PM »
I don't understand.  If I recorded my footage at 5407 fps and played it back at 60 frames per second is that different than if I had set the Chronos 2.1 to playback at 25 fps.  Isn't the playback rate independently set from the recording rate.  And for what I am trying to do, the only thing that should matter is the recording fps, i.e. in this case 5407 fps.

A different question:  Is there a way to check the accuracy of the fps on the Chronos 2.1?   Thanks.

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Chronos User Discussion / Re: Software for measuring velocity
« on: May 17, 2022, 04:08:34 PM »
I did write down the FPS as mentioned in my example in the original post.  Why do you think there is a discrepancy.  Also why do you think pressing the "next frame" button in AVS editor doesn't actually advance the frame until, in this particular case, eight presses of 40 milliseconds each are required to advance the frame.  I wonder if there is some kind of calibration that I need to do.

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Chronos User Discussion / Software for measuring velocity
« on: May 17, 2022, 02:41:27 PM »
Hi:  Can anyone recommend software for measuring velocity on a video shot using a  Chronos camera.  I'm measuring the movement of waves, so I would think the software needs to be able to move forward frame by frame.  I would like to be able to extract the frames as needed.  Also, I'll need to be able to draw a line on the video which will act as a ruler.  The line needs to show up on extracted frames.

Also, in video editing software, when advancing frame by frame, does the software for a typical program like AVS Video editor know what the frame rate was that the video was shot at (not the playback FPS).  I seem to be seeing some discrepancies.

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Are there finally plans in place to increase the 2.1 FPS.  Originally the promise was 100,000 FPS, which is one of the main reasons I purchased the camera.  But it came with a maximum of around 25,000 FPS.  Are any increases planned - even if it's only to 40,000 FPS like the 1.4?

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Chronos User Discussion / Heavy lenses
« on: January 22, 2021, 01:15:31 PM »
The Chronos 2.1 is heavy.  I want to attach a Nikon 80-200 mm F2.8 lens, which at almost 3 pounds is even heavier.  Based on weight, a tripod collar should be used on the lens which means that the 2.1 will be unsupported except at the screw threads between the camera nd the lens.

This sounds tenuous at best.  Any suggestions?

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Chronos User Discussion / Magnification changes as FPS changes
« on: December 09, 2020, 12:39:13 PM »
Can someone please help me understand how the magnification changes as the FPS changes. I think that a FPS setting of 1280 x 720 on the Chronos 2.1 color camera means that the frame is 1280 (pixels??) wide by 720 high.  Is my thinking here correct?

If I change it to 1280 x 240, then the image is magnified because the vertical  height is reduced.  Is that correct?  If correct, there should be a fair amount of magnification.  Is there any way to calculate the amount of magnification?

If I reduce the width from 1280 to say 640, then does that also increase the magnification in addition to any magnification increase due to decreasing the height?

I need to get a lot of magnification because I'm doing macro filming of sprays. Right now the extension tubes have the lens too close to the subject and it keeps getting very wet.

Any help is appreciated.

Thanks.

11
Thanks for the reply. I wish Kron would increase the priority of some of these serious bugs.  I understand that the camera is very reasonably priced, but it's typical that when a company doesn't have much competition (at this price point for example), the level of effort/urgency to fix issues is low.

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I should add that this appears to happen when the FPS is around 4000 and greater.  Also my Chronos is the color 2.1.  Thanks.

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Does anyone know why the color Chronos 2.1 won't show a live view if the analog gain is greater than 6 dB?

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Anyone know how to control the digital gain from the camera's webpage?  There is a way to control analog gain, but I haven't been able to find a way to control digital gain.

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Chronos User Discussion / Why the vertical color bands
« on: November 17, 2020, 01:14:27 PM »
Hi:

I'm starting to use my color Chronos 2.1 and I'm having trouble with  color vertical bands. The bands are much worse when I lower the exposure time.  Because I'm using the camera for scientific purposes, I need to use a low exposure time around 50 microseconds.  But I still get the bands at higher exposure times although not as strongly. Is there something I can do to get rid of these?

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