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Sony A7iii image specks

EmGH
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EmGH Newbie

EmGH

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I'm hoping someone can help me with this mystery. I've been having an issue with my Sony A7iii, where some images show hundreds of tiny bright specks. It only happens with my zoom lenses (Sony FE 4/24-105 and Sigma 100-400). It never happens with my portrait lenses.

I've attached a screenshot where the bright specks appear in my footage. You have to zoom in close to see them, they are tiny but ALL OVER the image - you can see them best in the dark areas. The weird part is, at this particular event it happened in some shots but not others. My lens was the same (Sigma), shooting placement was the same, the only thing that changed was the lighting. I have also noticed that a higher ISO seems to factor into whether or not the specks appear.

I thought maybe it had something to do with dust on the sensor, but I see no dark specks when I shoot against white (photo attached). There are a few tiny dust particles on the sensor, but nothing like the hundreds I see in my footage. I spoke with Sony support, and they told me to get my sensor professionally cleaned. This would be a very expensive thing to do, especially since it doesn't seem like dust is the problem.

I'm shooting in 4k, 24fps, manual exposure, 1/50 shutter speed.

I'm so baffled... I want to fix the problem but I can't figure out what the issue is. Any advice would be really appreciated! Thanks!

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Olaf W. Community Regular

Olaf W.

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10 hours ago, EmGH said:

higher ISO seems to factor into whether or not the specks appear

Exactly. You’re getting more noise from higher ISO values. You did not specify the used ISO values, but with values above ca. 3200 noise will most likely become visible especially in darker areas.

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EmGH Newbie

EmGH

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*I should have specified that this image is a screenshot from a video.

I wish I could say it was just noise, but the specks are stationary unlike grainy footage where the specks move around. If you look at the dark places in his hair, all of those little dots are static throughout the whole video. If multiple tests show no signs of dust, does anyone have any idea what this could be?

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FunWithCameras Community Regular

FunWithCameras

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13 hours ago, EmGH said:

*I should have specified that this image is a screenshot from a video.

I wish I could say it was just noise, but the specks are stationary unlike grainy footage where the specks move around. If you look at the dark places in his hair, all of those little dots are static throughout the whole video. If multiple tests show no signs of dust, does anyone have any idea what this could be?

Hot spots on the playback screen? Reflections on the screen from somewhere else?

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