Recent Posts

81

Software Dev / Re: Will there ever be a 100,000 FPS version again?

« Last post by B.H.V 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.

82

Software Dev / Re: Will there ever be a 100,000 FPS version again?

« Last post by hummingbirdography on December 12, 2023, 07:28:09 PM »

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

83

Chronos User Discussion / Re: Gated burst not working from external trigger

« Last post by bostonscot on December 12, 2023, 10:56:43 AM »

this sounds like the exact same issue I see.

84

Chronos User Discussion / Re: Chronos 1.4 Footage Thread

« Last post by B.H.V 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?

85

Chronos User Discussion / Re: Chronos 1.4 Footage Thread

« Last post by Solscud007 on December 11, 2023, 04:14:37 PM »

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==

86

Chronos User Discussion / Re: 100,000 FPS with the 2.1 as previously advertised

« Last post by B.H.V on December 09, 2023, 05:53:49 AM »

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?

87

Chronos User Discussion / Re: NEW: Chronos 4K12 and Chronos Q12

« Last post by B.H.V 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?

88

Chronos User Discussion / Re: NEW: Chronos 4K12 and Chronos Q12

« Last post by hummingbirdography on December 08, 2023, 12:49:36 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

89

Chronos User Discussion / Re: Gated burst not working from external trigger

« Last post by bostonscot on December 08, 2023, 12:49:30 PM »

update.  I can apparently generate a trigger that starts something recording.  Using the API I can see the number of entries in "videosegments" increasing, but only rarely does this include more than one frame per segment, and often it will spontanteously drop to one or two entries.  On the GUI I can see "recording" active, but at no point does this seem to lead to contiguous video from multiple button press.  It is in gated burst mode.  Can anyone send settings that work for them? 

90

Chronos User Discussion / Re: OLPF filter for Chronos cameras to reduce Aliasing/Moire?

« Last post by B.H.V on December 08, 2023, 08:43:27 AM »

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.