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Messages - B.H.V

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1
What's the resolution to get to around 40,000 fps with the 2.1?

Here are a few settings the Chronos 2.1 can achieve near 40,000fps

HResVResFPS
19202040496.8
12803237745.3
10243839787.8
8005239745.6

Would you be able to post video samples of each resolution?

2
Thanks ROB!

3
Lower bit depth data must be physically recordable by the cameras' sensors. In the event that the sensors are only meant for 12-bit capture, it could be challenging to achieve lower bit depths using firmware alone.

Yeah true.

4
yes the answer you have writes is perfectly fine

Not really, because this shows the 2019 revision has it at 18mm and 18mm but the 2020 revision as 15mm X 15mm which would not make sense.

5
Chronos User Discussion / Chronos 1.4 IR Filter Dimension Size Confusion?
« on: December 27, 2023, 07:17:07 AM »
Hi all, I'm seeing different dimensions for the IR filter size (See below links). Some documentation shows it as 15mm X 15mm, another shows it at 18mm X 18mm and 24mm X 16mm. What would the filter size be for a Chronos 1.4 received in 2018?

https://www.krontech.ca/wp-content/uploads/2020/01/IR-Filter-.pdf

https://www.krontech.ca/wp-content/uploads/2019/03/FM-ENGR-50001-Chronos-1.4-Datasheet-Rv4-1.pdf

https://www.krontech.ca/wp-content/uploads/2021/09/FM-ENGR-50001-Chronos-1.4-Datasheet-Rev5.pdf

6
Chronos User Discussion / Re: NEW: Chronos 4K12 and Chronos Q12
« on: December 25, 2023, 08:58:07 AM »
Hi
Is the square sensor of the Q12 made for all the 9-16 format requests that we get all the time?

www.ronaldkoetzier.com

You should have more flexibility for cropping to 9:16 when using the Q12 because of it's squarish sensor.

7
What's the resolution to get to around 40,000 fps with the 2.1?

8
Just an idea. Some of us like the smaller 2/3 sensor form factor as we can use modern sharp 0.95 and 1.2 lenses (Laowa Argus, Meike and Nokton) at their wider aperture receiving more light into the sensor while keeping a greater depth of field for easier focusing compared to larger sensors. And I'm guessing by using a smaller sensor and some other cost cutting measures (ie. cutting the maximum record time to 3 seconds which would require less RAM), the camera can be more affordable. Looks like GPixel has a 2/3 2K sensor (see below). Just a thought.

https://image-sensors-world.blogspot.com/2022/08/gpixel-announces-new-global-shutter.html
 
Some key specs:

"GSPRINT4502 is a 2.5 Megapixel (2048 x 1216), 2/3” (φ10.7 mm), high speed image sensor designed with the latest 4.5 µm charge domain global shutter pixel. It achieves more than 30 ke- charge capacity and less than 4 e- rms read noise, with dynamic range of 68 dB which can be expanded using a multi-slope HDR feature. Utilizing an advanced 65 nm CIS process with light pipe and micro lens technology, the sensor achieves >65% quantum efficiency and < -92 dB parasitic light sensitivity.

GSPRINT4502 can achieve extremely high frame rates up to 3460 fps in 8-bit mode, 1780 fps in 10-bit mode or 850 fps in 12-bit mode, all at full resolution. With 2×2 on-chip charge binning, full well capacity can be further increased to 120 ke- and frame rate to 10,200 fps. GSPRINT4502 supports vertical and horizontal regions of interest for higher frame rates. GSPRINT4502 is perfect for high-speed applications including 3D laser profiling, industrial inspection, high speed video and motion analysis."

9
Chronos User Discussion / Re: Chronos 1.4 Footage Thread
« on: December 20, 2023, 06:50:27 AM »
I use the 7Artisans f/0.95 35mm MFT lens. I usually film at f/0.95 or f/1.2.

I have a Meike 35 0.95 lens as well and it's pretty sharp at 0.95! My Meike 50 0.95 is a bit soft low contrast wide open but not too shabby. It sharpens up at 1.2 and up. One of the benefits of the smaller 2/3 sensor is we can use these wide open apertures as the DOF is greater and more forgiving in getting the subject in focus.

10
I see the new 4K12 and Q12 have the option for a Sony E mount adapter plate. Can the 1.4 and 2.1 get that same option as well?

11
Software Dev / Re: Will there ever be a 100,000 FPS version again?
« on: December 13, 2023, 08:23:49 AM »
I have the color model of the Chronos 2.1 and the fastest framerate I was able to configure it to calibrate & record was 114,504fps at 800x8 resolution, which would be 3,816.8x slow motion with a 30fps playback. These numbers seem to deviate from the specs on the Luxima website. For example, the maximum framerate at 1920x8 resolution reported by the camera is 73242.2fps, however the Luxima website states 125,000 FPS @ 1920 x 8

The configuration process is not very hard or time consuming. Simply follow the steps @sanjay described earlier in this thread, except for Step #6, use the following instead:

nano pychronos/pychronos/sensors/lux2100.py
     change MIN_VRES = 96 to MIN_VRES = 8 on line 32
     change numRows = 64 to numRows = 16 on line 652
     save and exit the file with Ctrl + O then Ctrl + X

Furthermore, it may be of interest to modify the /var/camera/resolutions file as @mklinger mentioned. For both the 2.1 and 1.4, that's used for populating the presets drow-down menu and the list of resolutions which the "Black Calibrate All Resolutions" button triggers calibration data to be created for

Thank you! I'll give it a shot.

12
Chronos User Discussion / Re: Chronos 1.4 Footage Thread
« on: December 12, 2023, 07:38:58 AM »
Filmed a Hungarian GM6 Lynx .50 BMG rifle with the Chronos. First time actually designing sound for the video.

https://www.instagram.com/reel/C0s1HWKr6L5/?igshid=N2ViNmM2MDRjNw==

Nice! What lens are you using and what fstop do you usually shoot at?

13
My understanding is that we can't get these frame rates because of an H.264 encoder issue. If that's the case, can it be made available when doing RAW DNG shooting?

14
Chronos User Discussion / Re: NEW: Chronos 4K12 and Chronos Q12
« on: December 08, 2023, 01:02:55 PM »
Thanks Sanjay! Is there a reason why the 1.4 and 2.1 can't allow for adjustable bit depth? Is it a sensor thing?

The bit depth limitations are dictated by the sensor. Both the Chronos 1.4 & Chronos 2.1 image sensors only provide 12-bit analog to digital converters:

Chronos 1.4: https://www.luxima.com/product_briefs/LUX1310.html
Chronos 2.1: https://www.luxima.com/product_briefs/LUX2100.html

The Chronos 4K12 uses a GSprint 4510 image sensor, which provides support for 12, 10, and 8 bits per pixel

https://gpixel.com/en/pro_details_1191.html

Understood! Thanks! Looking at the spec sheet of the Gpixel, does that mean HDR could be enabled in future firmware updates to the 4K12 and Q12?

Another thing, I'm reading the spec sheet of the 1.4 and 2.1 and saw this.

"Up to 1,000,000 FPS @ 1280 x 1"


"125,000 FPS @ 1920 x 8
It can be windowed down to achieve frame rates of 300,000+ FPS"


If I understood correctly, the reason we can't get these frames rates is because of an H.264 encoder issue so can it be enabled when doing Cinema DNG RAW shooting?

15
I feel your pain with the filter juggling act. Been messing with external filters on my setup too. It's a hassle swapping them out for different focal lengths, right? Your shots look solid, though. I've been eyeing the Chronos 4K12 myself, but you're right.

Nice Moonlight! Are you using Caprock filters? I want to try out the Q12 because the squarish sensor would pair very well with my anamorphic gear. It looks like tho it isn't as popular as only one Q12 has sold so far from what I've seen on the order page. Also, I found that VEAI upscaling doesn't do so well with unreadable fine texts and makes it alias more. I hope VEAI will create a model to keep the texts as is even if it's not readable. I try to avoid having fine print lettering in my shots.

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