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Topics - clkdiv

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today I wanted to try a resolution I never tried before and I could not make it work. I tried 832x456 @ 5682 fps and got some really ugly fast moving stripes at the left side of the display, which appear in the footage too. After fiddling a while it turned out that all of the resolutions with 832 width have the same problem.

I attached three of the recorded frames, the stripes are visible in each frame. The problem appears only at this resolution. Restart, black calibration and changing gain won't change anything...

Do you encounter this on your 2.1 too? Help is really appreciated. Thanks! Martin...

General high-speed discussion / Upscaling footage
« on: July 12, 2021, 03:27:30 PM »

now that I got the sweet spots for my camera (thanks to mklinger) I tried higher frame rates to see whether the footage afterwards can be upscaled without becoming ugly.

So I tried some different approaches, but in the end I came up with two workflows that might work. Maybe this is of use for somebody, so:

1. Using Adobe camera RAWs new feature "Super Resolution", which will convert an existing DNG into a new DNG with twice the resolution while keeping the RAW data intact. Actually it bakes the upscaling recipe into the DNG. So one doesn't loose the overhead from the RAW. Unfortunately only Adobe Software can deal with theses enhanced DNGs. When scaling up a 1152x648 frame to 2304x1296, the "enhanced" DNG can be read with DaVinci, but it stays at 1152x648. So going the Adobe way the workflow is a) grade and enhance (new super resolution) the DNGs e.g. from within Lightroom, then b) export these enhanced DNGs from Lightroom as 1920x1080 TIFF sequence.

2. Grade and export the DNGs from within Lightroom without "super resolution" to TIFF, then let e.g. Topaz Gigapixel AI do its job upscaling to 1920x1080.

I attached a PSD with three layers: one from Gigapixel, one from Lightroom Super Resolution, and one from the original  DNG to TIFF without scaling. Although Gigapixel is a somewhat over the top with sharpening, I will stick to it.

There is something to mention, too: The "Enhance Photo" function does a very good job on Moiré. Look at 200% at the roof in the background, there were no vertical roof joints, it is Moiré! GigaPixel simply enlarges it, while "Enhance photo" addresses it quite well. So maybe even when using GigaPixel or equivalents for upscaling, you might want to use Adobe Camera Raws "enhance photo" additionally before exporting.

Have fun!

Software Dev / Feature request: Toggle Input for IO2
« on: July 03, 2021, 12:56:59 AM »
Hello, I wonder if it was possible to get a toggle function for IO2. At the moment this is available only at IO1, BNC, this makes a setup unnecessary clumsy.


General high-speed discussion / Fixed pattern noise removal
« on: June 20, 2021, 02:05:40 PM »

I wonder if someone has some tips to get rid of fixed pattern noise, anyone having a good worklflow?


Hello girls and guys.

I succeeded making the camera map a shared SMB folder on my notebook. But I wonder, if it is possible also to do this the other way round? Make the Notebook map a storage at the camera?


Also: The card for the OS has two partitions: A very small one with some boot stuff on it, and a  big one I can't access from within windows 10. Anyone knowing how to access the larger partition, when having the card in the card reader?


Hello, thanks for reading this.

The record mode called "live slow motion" would be useful for me, but only if it could be triggered by either an external trigger or the web interface. Both is not working. Only the "real" red record button allows using this mode. Is there anything I can do about that?

And, btw., same thing with the "live record mode" that automatically records h264 @ 60 fps additionally to the slow motion. That would be useful too...

Thanks. Martin.

Hello, today i recognized a strange ghost shadow caused by a bright object within the frame. I shot a clip where water drops move towards the camera and sometimes the bright sun makes the drop burn out to pure white. That's normal. But every time such bright drop passes the cameras view, the drop causes a ghost shadow. See the attached clip, please.

Does anyone know whats going on there?

Actually I recognized this before when I had a scenery with strong contrast: At the left side of the image I had some trees and at the right side a bright sky with a meadow beneath. So the lower half of the image was more or less evenly lit, trees to the left, meadow to the right.  But the upper half of the image had much more dynamic range: at the upper left the trees (dark) and at the upper right the bright sky. This strong contrast caused the upper half of the trees being much darker than their lower half, the trees were completely unevenly lit.

On my Chronos 2.1 I would like to grab the Frame Sync Output at the BNC to feed it into an Arduino. For visual feedback, I tried very slow 3 fps on the Chronos to toggle an LED.

But the output of the Chronos is always high, it simply is closed and doesn't do anything. Someone any advice?


Hello nice girls and guys and in-betweens...

I am running a 2.1 color and wonder if there is any chance to have a histogram? While searching, i remember the some months ago released software with a more modern GUI, as mentioned here. Did that have a histogram?

And another question: Is it possible to have a crosshair on the screen to align the camera as good as possible?

Thanks! Martin

Chronos User Discussion / FFPMEG: Fastest conversion of DNG to MP4
« on: November 08, 2020, 06:55:21 AM »
Hello! I am shooting in RAW and tried to convert the RAWs to H264/MP4. Now FFMPEG is really fast on that: On my old I7 with 6 cores it converts with 55fps. This is because it uses the GPU.

Unfortunately the output is dark and greenish, but at least I have a fast glance of what happened while recording.

When converting the DNG to TIFF first and then putting them together into a MP4, everything is "normal": White balance, colors, black level.

Does anyone have any experience converting DNGs directly into a video using the GPU?

Thanks! Martin

Chronos User Discussion / Saving over network: Speed question/issue
« on: October 23, 2020, 08:48:57 AM »
Hello nice girls and guys.

Just a quick question: I am shooting quite much with my 2.1 and it would be nice to have the camera save as fast as possible over network (smb). I wonder if it is possible to make that as fast as to eSata/SSD, which I also have connected? Where are the limitations?


Hello nice girls and guys.

I would like to create a very sudden fps-change from 1000 fps to 1 frame per 10 seconds (timelapse) with gated triggering on IO3. So start e.g. with 1000 fps and 180 degree for say 2 seconds, then suddenly doing timelapse with one frame each 10 seconds, with the same exposure times for each frame of course. I want to drop crushed ice, capture that with 1000 fps, then, when the ice stopped moving, I want to switch to Timelapse mode: one frame every 10 seconds.

I succeeded to make the camera film with 1000 fps with the external signal, but I failed to do the timelapse part. The Trigger IO is set to IO3 - Shutter Gating, no invert, no debounce. I connected an Arduino to IO3 and provide 5 Volt to the camera for triggering.

In Timelapse mode I expected the camera to expose the frames as if in 1000fps mode, but instead everything is bright and I get a lot of motion blur. I can't figure out, what I am doing wrong. Everything seems to meet the requirements for the gated burst signal as described in the manual. I also tried with "Exposure trigger" mode for IO3, which should also work, since the falling edge of the input signal is not important for the exposure time, no?

Here is the code that works as long as the delay(10000) is commented out:

         // delay(10000);


Anyone having an idea?



Hello! Now that I got more light for filming with my Chronos 2.1, I am able to close the lens aperture much more than before. Now this makes so much dust on the sensor showing up that it becomes critical.

Although I  used rocket blowers to clean the sensor on my DSLRs, I wonder if there is anything special about the Chronos sensor, if someone has some tips, and even more, if there are any suggestions on how to avoid it? I feel really uncomfortable dealing with such an expensive sensor.

Thanks! Martin.

Chronos User Discussion / Nice people @ Krontech
« on: June 09, 2020, 02:02:52 AM »
Ok, nice people at Krontech!

now that I managed to establish the WLAN-connection to my 2.1, I was for the first time trying out the http-based GUI for the camera. I am so overwhelmed how nice and smooth all works and now that I grasp the possibilities by completely controlling the camera not only with this GUI but also with JavaScript, I really have so say this publicly:

THANK YOU! I did not really know, which incredible camera and work I got for my money, and which part I missed until now. Thank you, honestly!

Now I got to dig into the API! Woooohooo!  :)

Chronos User Discussion / Wireless down/upload of footage
« on: June 03, 2020, 01:57:21 PM »
Hello nice people,

I'd like to download shots from a 2.1 wirelessly. My idea is to connect a small router to the Ethernet port of the camera, then map a connected folder on a PC, so data would automatically be saved to that.

Do you think this might be possible, or even better, did anyone already try such setup? Or does anyone have any suggestions or annotations to that?

Thanks a lot!


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