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Shutter speeds at certain depths

Started Nov 7, 2019 | Discussions thread
peterak Regular Member • Posts: 145
Re: Shutter speeds at certain depths

Barmaglot_07 wrote:

Unlikely. This shot was taken at ~30 meters depth, ambient lighting (made worse by this being early morning, 6 AM), using a Sony A6300 (APS-C) with 16-50mm f/3.5-5.6 lens at 35mm f/5.6 (as wide as it would go at that FL), shutter speed 1/320, and auto ISO went all the way to 3200, resulting in evident noise:

1/1.7" f/2 is slightly slower than APS-C f/5.6, and if your ISO goes down four stops, the exposure time must compensate accordingly, going up to 1/40s, pretty much guaranteeing motion blur.

This is incorrect. Exposure is determined by f-stop, shutter speed, and ISO, regardless of sensor size. With the advantage of its f/2 lens, the TG could capture that shark at f/2, 1/320, ISO 400. (Three stops more aperture, three stops slower ISO.) Shark will of course take up a smaller portion of the image, since you'd be shooting at 25mm equivalent as opposed to 35mm.

The TG's tiny sensor will have similar or worse noise at ISO 400 as the A6300 has at 3200, and probably worse dynamic range as well, but that's another story.

Not at all suggesting that the TG is superior--except maybe for macro--to the A6300. Just pointing out that that fast little lens can be very helpful.

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Peter

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