Recent Posts

1

General high-speed discussion / Re: Kron Schlieren Imaging tutorial

« Last post by Userms on October 11, 2024, 04:47:59 PM »

I stumbled onto your post and thought you might be interested to know that there are other ways to do Schlieren that do not require a parabolic mirror or an optical setup! Instead the effect can be measured using software and a speckled background (background oriented).
This way you are not limited to the size of the parabolic mirror... in fact you don't need the mirror or a point light source at all!
It makes for a much simpler setup and you can set the effect scale after the recording.

Reference: https://www.motion-scope.com/background-oriented-schlieren

2

Chronos User Discussion / Re: timing of external trigger

« Last post by Userms on October 11, 2024, 04:35:40 PM »

Were you able to resolve the issue?

3

Chronos User Discussion / Re: Green fringing motion problem

« Last post by Photopage on October 03, 2024, 03:48:41 PM »

Thank you Rob. This makes perfect sense. 
I'll try to move my client away from bright white backgrounds for future work.
Much appreciated!

Colin
 

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Chronos User Discussion / Re: Green fringing motion problem

« Last post by Rob_G on October 03, 2024, 02:25:59 PM »

Hello Photopage,

The artifact displayed in your image is a known issue with the sensor of the Chronos 2.1.This happens when the when the background it illuminated significantly. The pixels of the sensor saturate with charge. Not all the charge can be removed when the exposure ends and before the next frame is exposed. This creates a ghost in the image from the previous image. It is more obvious when there are regions of fast motion, like the fast moving cork in the image.

The green color may come from the illumination itself. In the white light the green is the most prevalent wavelength. Also, the sensor color is more sensitive to green as Bayer filter array has two green components, one blue and one red.

5

Chronos User Discussion / Green fringing motion problem

« Last post by Photopage on October 02, 2024, 06:54:23 PM »

I have an intermittent problem with my Chronos 2.1 and I'd appreciate other users help.

Sometimes there is a green fringe, which appears to be a misaligned frame.  On faster motion the fringe is more obvious, so I don't think it's a lens issue.

Any ideas, and any way to stop this in future?
Is it a black calibration thing?  I calibrate at the start of the day, and if I make any changes to frame rate or shutter angle/exposure.

Shooting at 1000fps.
Nanlux LED lights at 100% (no flicker)

I've attached two RAW frames of a champagne cork popping where you can see the clear difference in green fringe as the cork accelerates.
Thanks

6

Chronos User Discussion / Re: Can I hire/rent someone and their Chronos high speed camera for a day?

« Last post by headthousan on October 02, 2024, 04:01:20 AM »

I am saving up to get a Chronos 2.1 but it will be a while until I will have an extra $8k for the camera and the necessary accessories.  Is there anyone in the Utah, USA area that I could hire for a day to film some stuff in slow motion?

Nothing too scientific or crazy but I want to be able to analyze my 1/6th scale tank APFSDS rounds that are fired from my 1/6th scale tank main cannon via 1,000-3,000 psi pneumatic pressure. I have a test box that I am using that has ½” of polycarbonate on all sides and 1 side with 2x 1/2” polycarbonate sheets (that we would stand behind). I have already verified that the heaviest APFSDS round has barely enough energy to penetrate 0.375” of polycarbonate and that’s only at max pressure that I won’t be testing to (I want to start teh first day testing at 1,000psi as that still plenty exciting) so its fairly safe but if it still worries you we can add another ½” of polycarbonate to the viewing side so we can safely have 1.5” of spaced PC (the thickness of the MythBusters PC blast shield).

Well its a shot in the dark but I thought I would ask...

Go to camera groups and ask questions like Twitter, Facebook or something. I'm sure someone will help you.

7

Chronos User Discussion / Re: Is there anything that can be done to improve this?

« Last post by asilymurky on October 02, 2024, 03:20:08 AM »

This is a limitation of recording products at a fast rate. But this delay is usually not a big deal if you don't set the time interval too fast.

8

Chronos User Discussion / Chronos 2.1 HD for sale in Chicago

« Last post by directorbryce on September 26, 2024, 09:48:57 AM »

Hello all -

This camera needs no introduction, but it's amazing. We've used it exclusively indoors in our studio here in Chicago to shoot extremely fluid 1000fps shots at 1080P for a series of 10 shoots, So it's barely been used as most of our content is 24fps. And since we need to invest in a motion control unit, we need to sell!

Included is both the EF adapter, as well as the Micro 4/3 lens adapter. Both work great, but we found the Micro 4/3 to enable more options due to the ability to also use a speedbooster and an even wider lens variety. Ships with it's original box and a power adapter. Note, the Canon lens in the photos is not included.

Shipping in the USA for $50. Looking to sell for $5000

Unfortunately the Captcha system in the direct messaging on here doesn't accept my answers, which are correct, so I'm unable to reply to DM's currently. Please email me at: [email protected] if you're interested. Thank you!

9

Chronos User Discussion / Re: HDMI & Odyssey 7Q?

« Last post by Johnsondavid on September 24, 2024, 07:23:09 PM »

Have you made sure that the camera's output resolution is compatible with the Odyssey?

10

Chronos User Discussion / Anyone tried to use Chronos to film a fly path of a projectile with moving mirro

« Last post by Whosseem on September 12, 2024, 01:34:39 AM »

Anyone tried to use Chronos to film a fly path of a projectile with moving mirror ? Considering to buy monochrome model for this, any advice / thoughts greatly appreciated.