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FUJIFILM X-T4 strange noise banding in video

Started 9 months ago | Discussions
Bangmouse New Member • Posts: 3
FUJIFILM X-T4 strange noise banding in video

Hi I'm new to Fuji and recently purchased the XT4, mostly for video work, and its low light performance and filmic, grain-like noise were major factors in the decision.

Problem is, I'm noticing strange banding in the noise at higher ISO's, rendering any footage shot above 1000 unusable. These are stills from 4k video, shot at 2000 ISO with a contrast curve added in photoshop to hghlight the issue:

It seems to correspond to the contrast in an area somewhere on the left side of the screen:

Mysteriously, the effect does not show up in stills.

Anyone got any idea what's causing this? Is there anything I can do to fix it? It's extremely frustrating because it limits how I can use the camera for professional work, but also disappointing because I love literally everything else about it!

Bast Hotep
Bast Hotep Regular Member • Posts: 298
Re: FUJIFILM X-T4 strange noise banding in video
4

I don't know what your lighting situation is, but artifacts like this are often caused by rolling shutter when using LED or fluorescent lights on almost any camera. If that's not it...I don't know.

 Bast Hotep's gear list:Bast Hotep's gear list
Fujifilm X-S10 Fujifilm X-H2S Fujifilm XF 60mm F2.4 R Macro Fujifilm XF 16-80mm F4 Fujifilm XF 70-300 F4-5.6 R LM OIS WR +7 more
OP Bangmouse New Member • Posts: 3
Re: FUJIFILM X-T4 strange noise banding in video

It's not the soft, regular banding that you see in those situations, it's like there's an area on the left whose high contrast "smears" across the rest of the image, affecting the noise. Changing shutter speed doesn't seem to affect it.

Bast Hotep
Bast Hotep Regular Member • Posts: 298
Re: FUJIFILM X-T4 strange noise banding in video
1

Do you use mechanical shutter for stills?

If so, see if you get the noise using electronic shutter. That might narrow it down...assuming there's nothing on your sensor.

 Bast Hotep's gear list:Bast Hotep's gear list
Fujifilm X-S10 Fujifilm X-H2S Fujifilm XF 60mm F2.4 R Macro Fujifilm XF 16-80mm F4 Fujifilm XF 70-300 F4-5.6 R LM OIS WR +7 more
OP Bangmouse New Member • Posts: 3
Re: FUJIFILM X-T4 strange noise banding in video

Tested it like you said, and yeah I'm able to recreate it in stills with electronic shutter. These were taken under the same conditions with the same settings (film sim nonwithstanding) and again boosted to demonstrate.

Still:

video:apologies for the messy room

So it does seem to be associated with the electronic shutter. It's hard to capture in still images but the banding seems to be determined by the contrast in a column somewhere on the left of the sensor, and moves with whatever's going on there, almost as if there were a smudge on the lens, but it's perfectly horizontal and only seems to affect the noise, and only at certain exposures.

This was all natural light.

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