Weird vertical seperation in BMPCC4K image?

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Zweistein

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Weird vertical seperation in BMPCC4K image?

PostThu Jan 14, 2021 11:01 am

Shooting a casting with my BMPCC4K i noticed a vertical seperation in some of the footage. I grabbed a still in Davinci Resolve and graded it so that you can clearly see the seperation in the image below.

vertical_line.jpg
vertical_line.jpg (670.36 KiB) Viewed 356 times


The BMPCC4K settings are:
BRAW Q0 – 2.6K – ISO 1000 – 24 FPS – 180° Shutter Angle – Firmware 6.9.5

I guess it is not fixed-pattern noise, because there is not pattern, just a seperation.

Do you know what caused this?

EDIT 19.01.2021
I did some testing: Different frame rates (24, 25), different sensor modes (4K "Full Sensor" & 2.6K "Windowed Sensor"), different ISO settings (400-25600). Results:
The frame rate and sensor mode (resolution) do not have an effect on it. But the ISO seems to have. It seems to appear only in ISO 1000 and below.
Last edited by Zweistein on Tue Jan 19, 2021 9:05 pm, edited 2 times in total.
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rick.lang

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Re: Weird vertical seperation in BMPCC4K image?

PostThu Jan 14, 2021 6:40 pm

Do you see that vertical lines in other shots with different settings? Do you see it with ISO 400? Only in 2.6K?

Try updating to the latest firmware by downloading the most recent Camera Setup update from the BMD Support page.
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Zweistein

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Re: Weird vertical seperation in BMPCC4K image?

PostFri Jan 15, 2021 2:57 pm

Thanks for your answer. I don't have the camera here do do some more testing right now.

Here is one more still, which has the separation. First with applied LUT, then without:

vertical_separation_LUT.jpg
vertical_separation_LUT.jpg (698.3 KiB) Viewed 291 times


vertical_separation_RAW.jpg
vertical_separation_RAW.jpg (830.85 KiB) Viewed 291 times


I will update to the new firmware.
Last edited by Zweistein on Tue Jan 19, 2021 9:05 pm, edited 1 time in total.
Davinci Resolve Studio 16.2.8.005
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carlomacchiavello

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Re: Weird vertical seperation in BMPCC4K image?

PostFri Jan 15, 2021 4:04 pm

uhm, try to rest camera, recalibrate sensor and test again with cap, with gray paper and see if there is the problem, if it s still present, contact assistance bmd by web site from support section, scroll down the page and use the form to request assistance.
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Zweistein

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Re: Weird vertical seperation in BMPCC4K image?

PostFri Jan 15, 2021 4:13 pm

carlomacchiavello wrote:uhm, try to rest camera, recalibrate sensor and test again with cap, with gray paper and see if there is the problem, if it s still present, contact assistance bmd by web site from support section, scroll down the page and use the form to request assistance.


Thanks, I will do that as soon as I have the cam here to test. Then I will post the results here.
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rick.lang

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Weird vertical seperation in BMPCC4K image?

PostFri Jan 15, 2021 4:39 pm

Carlo, there is an option to Remap Pixels, but there is no Calibrate Sensor function on the BMPCC4K.
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carlomacchiavello

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Re: Weird vertical seperation in BMPCC4K image?

PostFri Jan 15, 2021 6:09 pm

rick.lang wrote:Carlo, there is an option to Remap Pixels, but there is no Calibrate Sensor function on the BMPCC4K.

Right Rick, i forget that :-(
i had ump and pockets, and forget that calibration is ursa only.
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Pedro Nuno

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Re: Weird vertical seperation in BMPCC4K image?

PostSat Jan 16, 2021 12:21 pm

Same problem here since I got my P4K three years ago . Reported and send it to be serviced in the UK. Blackmagic was politely supportive but never solved the problem. In my case the only solution — which only disguises this anomaly — is to shoot at 1250, where in shadows to light transition situations. As soon as ISO is superior to 400 it only gets worst and nothing can be done. The same can be said at ISO superior to 1250, but less noticeable. If this is not an expected behaviour from the sensor, Blackmagic should have done better in supporting those who reported it.
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Zweistein

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Re: Weird vertical seperation in BMPCC4K image?

PostMon Jan 18, 2021 9:58 pm

I updated the firmware – still the vertical seperation.
I remapped the pixels – still the vertical seperation.
I reset camera settings – still the vertical seperation.

Tormorrow I will do a few more test, to define at which exact settings the seperation appears.

I will also contact the support.
Davinci Resolve Studio 16.2.8.005
EIZO CG247X (via UltraStudio Mini Monitor 11.6)
Davinci Resolve Micro Panel
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Zweistein

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Re: Weird vertical seperation in BMPCC4K image?

PostTue Jan 19, 2021 9:06 pm

I did some testing: Different frame rates (24, 25), different sensor modes (4K "Full Sensor" & 2.6K "Windowed Sensor"), different ISO settings (400-25600). Results:
The frame rate and sensor mode (resolution) do not have an effect on it. But the ISO seems to have. It seems to appear only in ISO 1000 and below.

Support will be contacted tomorrow – I will post updates here.
Davinci Resolve Studio 16.2.8.005
EIZO CG247X (via UltraStudio Mini Monitor 11.6)
Davinci Resolve Micro Panel
macOS 10.15.7 (19H114)
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rick.lang

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Re: Weird vertical seperation in BMPCC4K image?

PostWed Jan 20, 2021 12:37 am

That’s very strange that the ISO 3200 range is fine. Not the best solution but good you have that option working well.
Rick Lang

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