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Extreme low light video: a7s III Vs a7 IV

Started Mar 7, 2022 | Questions thread
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RussellPhotoNerd Junior Member • Posts: 45
Extreme low light video: a7s III Vs a7 IV

Howdy all,

I've been using a Sony a7s Mk1 for a year or so with a few decent E-Mount lenses which I use for both video and photo of the night sky an landscape. I am finding I am much more a video guy than a photo guy though, probably to a point of an 70/30 split.

I've been looking at the a7s III and more recently the a7 IV. The a7S line has always been considered amazing for low light, however I've been really impressed with the high ISO (25600+) video examples I've seen coming from the a7 IV. Given I shoot at 24p 1/25 with ISO between 25600 and 64000 in Slog-2, I would have thought the a7s III would have a fairly clear advantage here given it's 2nd native ISO is 12800 Vs the 3200 of the a7 IV. I'm guessing it is the significant over sampling of the a7 IV that is able to reduce the appearance of noise?

Anyway, just wondering if anyone could give me some advise on which of these two cameras would best suit my use case? For instance, would thermal noise performance at high ISO be better on the a7s III Vs the a7 IV? Honestly I'm really just a little bit baffled how comparable the two cameras look from the samples I've seen all the way up to ISO 51200.

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Sony a7 Sony a7S
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