So a f/1.8 on a 1" sensor would still gather more light than a f/3.5 on an APS-C?

Started Sep 18, 2022 | Questions thread
YangMills Regular Member • Posts: 142
Re: Back to the original point:

Bob A L wrote:

PhotoTeach2 wrote:

If "noise" is NOT A FACTOR (until noticeably-objectionable), then my main advantage is (only) the 2-stops "SS" advantage, (because it is a "faster" lens).


But for some reason apparently important to many, noise keeps creeping into whether exposure is correct or not. I have seen many photos that appear to exhibit perfect exposure, that exhibited what I thought to be excessive noise, and have likewise seen many photos that were totally free of noise that exhibited what I consider absolutely terrible exposure.

Why can't you understand that

  • f/1.8 on 1" sensor, ISO100, 1/100s, and
  • f/3.5 on apsc sensor, ISO400, 1/100s

given the same scene brightness and pespective, will yield the same output (noise, motion blur, DoF, diffraction and image lightness) within 1/3 of a stop. There is no 2 stop advantage in this scenario.

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