Best Portrait Combo?

Started Aug 7, 2014 | Discussions thread
Ido S
Ido S Veteran Member • Posts: 4,955
Re: Best Portrait Combo?

69chevy wrote:

If you are shooting at f1.2 for ISO purposes, a crop sensor would gain you some DOF but then cost you 2 stops since there is no crop sensor that even comes close in regards to noise.

2 stops? You've got to be kidding.

Sony a7S and Sony a6000. Perhaps the two best sensors at high ISO at their respective size formats.

I looked at the measurements for each over at Not the scores - I went straight to the Measurements tab, and then clicked on SNR 18%. Here's what I've found:

At ISO 12800, the a6000's SNR is 22.7 dB. The Sony a7S, at ISO 25600 (1 stop difference), is rated at 22.3 dB. Conclusion: The king of low-light of all 35mm full frame sensors, is just 1 stop better at high ISOs than the best APS-C sensor for low-light. Yup.

If the point were flipped, I would not try to prove it in a technical way. But I know that people who say these statements, don't really care about how the picture looks.

I won't get into equivalency here - but just remember that with an f/1.2 lens on a 35mm full frame body, you can pretty much stop down by a stop and compensate for that with ISO, and get a similar-looking image to what you've suggested.

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