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Messages - Bian

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Chronos User Discussion / Re: Post Chronos 2.1 clips here!
« on: May 20, 2021, 01:11:06 AM »
Hey guys!

Look at the slow-mo chemical reactions on my youtube channel :D - Chronos 2.1, 1920x1080 1000FPS & 800x600 4352FPS, Samyang 24mm & 100mm macro.

Cool video! I think you are using the V0.6 firmware. Did you notice the "pink" color of the smoke at 4352 fps?

Chronos User Discussion / Re: Lens Mount for Chronos camera
« on: May 11, 2021, 10:04:27 PM »
I build two MFT-adaptors for my Coronos 1.4 and 2.1 and they will work fine. So I am able to use  greater bandwith of lenses, beacause there are several adaptors for other types available.
My choise for this solution was, that it was no great problem to realise it and the possibility to use my Nikon lenses with a Metabones adaptor which is able to adjust the aperture of the lenses I use for my Nikon Camera too.

Chronos User Discussion / Re: 5" LCDVF adapted to the Chronos?
« on: April 09, 2021, 10:49:12 AM »
Looking at options to allow run and gun with the camera I came across this 5" LCD viewfinder for the Blackmagic PCC 4k and 6k that may fit the Chronos.

Wondering if the dimensions will fit the Chronos as it looks a bit too wide and if anyone has experience with it? 

I did find an old thread with a Grid 5 viewfinder that had some success but doesn't look like an optimal solution as it needs modifications.

I believe this accessory if done well could be a killer part of the Chronos kit.   :o

Hi, I use the Kinotehnik viewfinder since last year. It works realy fine. A smal iron  frame is simply attached with adhesive tape to the black screen frame.

Chronos User Discussion / Re: Chronos 1.4 Footage Thread
« on: April 01, 2021, 05:17:03 AM »
Some sequences from my Chronos 1.4 at 5900fps (because 2.1 doesn't work well at this resolotions) - upscaled at full HD with Topaz Video Enhance AI

Software Dev / Re: Chronos V0.6.0 Full Release
« on: March 23, 2021, 04:55:11 AM »
The linked instructions say that special factory calibration files are no longer needed for both the 1.4 and the 2.1, while the first post here only mentions the 2.1 can anyone please clear this up? Can the 1.4 generate it's calibration entirely on its own or is this limited to the 2.1?
Also, as the update currently cant be done "in place" but requires an SD-Card update, is the existing "factory" calibration data still relevant ion some way (like providing better results?)

Thats right - the 1.4 generate its calibration internally - only the 2.1 needed their own factory data. For a new calibration both cameras need te same process now.

Software Dev / Re: Chronos V0.6.0 Full Release
« on: February 26, 2021, 01:52:08 AM »
A little comparison between 1.4 and 2.1 - both with V0.6.0
Outdoors, no clouds.
Framerates: 17391 (1.4) and 16191 (2.1) recorded as TIFF

In my opinion the 1.4 picture looks well - the 2.1 picture is very flat....

Software Dev / Re: Chronos V0.6.0 Full Release
« on: February 20, 2021, 05:30:16 AM »
I also noticed some Horizontal "Banding" (or whatever one would call that?) when Overexposed Areas are In Frame right next to dark areas. Dont remember them to be this visible in the Last Version, but will double Check, if i find time for that. I also dont really know, if this is just a Flaw of the Sensor itself, or if this is a software thing. Still way more organic looking than the Vertical Lines from the Last version, but if this could be improoved would sure be neat. Here is two DNGs in a .Zip, from me trying to reproduce this Banding.
 #EDIT#: Forgot to put the Settings that this was shot at here: 35mm 2.8 Russian Lens, 12dB gain, 359 1kfps

I can confirm this. In addition, i made another observation - if the white areas decline at 50 IRE it looks like they get pink....

Software Dev / Re: Chronos V0.6.0 Full Release
« on: February 13, 2021, 06:02:46 AM »
Did some tests and also a comparison between 2.1 and 1.4 with the new version 6.0 and the vertical banding is nearly dissapeared.

At the moment the 2.1 needs much more light than the 1.4 and there is somting strange with the video signal level (tested with an external monitor portkeys BM5II). Its not possible to get a video level more than 90 IRE and at lower resolutions the level declines at 30 IRE @ 640x360.

On the other hand the 1.4 allowed a level to 100 IRE and with the same lens and at the same time the level was at 55 IRE @ 640x360.

it seems, that the new software reduces the dynamic range a lot, so that it isnt possible to use the full video level from 100 IRE.

Has someone made a similar observation?

I would like to put a speedbooter too.
Do you have any tips to remove the CS steel ring without damaging the sensor, did you use a special tool?

Its realy easy to remove it: Unscrew the little hexagonal socket screw at the bottom of the camera (its also for adjusting the flange back) - remove the scew and the little metal pin. Then you are able to unscrew and remove the steel ring.

Software Dev / Re: Chronos V0.6.0 Full Release
« on: February 09, 2021, 10:42:52 AM »
Thanks for this update!!

One question to calibrate the camera - is it necessary to use a lense cap in step 1 too?

What i mean is, that there is not enough light, the aperture has to be completely opened (for example f2.8) and despite the open aperture, the maximum signal level is too low (<0,7V)

The difference is hardly noticeable .....

From my experience the problem occurs at a lower aperture - its possible to try it with f2.8?

Chronos User Discussion / Re: What Lights Do You Use?
« on: February 02, 2021, 08:18:34 AM »
I use a pair of Godox SL150W with Apture Fresnel attachments and one Godox SL150WII

Chronos User Discussion / Re: Why the vertical color bands
« on: December 31, 2020, 12:37:13 AM »
I did some tests with a colour chart and several resolutions.

Setup: Chronos 2.1, software: unstable 20201125, Kamlan 50mm, aperture 1.1 (ful open), colour temp 5.600k, saved as TIFF

Room temperature: 21 degrees Celsius
Maximum camera temperature after 30 minutes warmup: system 47.2 degrees, sensor 46 degrees
Black calibration before the first shot and after changing the resolution
One shot was taken with 25% signal level - the other with 80 % - no colour grading

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