Potential dead horse: how bad is FF's deep DoF disadvantage?

Started Mar 5, 2014 | Discussions thread
Mike Davis Contributing Member • Posts: 829
Re: Zero

Allan Olesen wrote:

Mike Davis wrote:

There's a five-stop difference between f/3.2 and f/17.7.

If the large sensor is using f/17.7 at ISO 100 to yield a given DoF, diffraction, and signal-to-noise ratio for a given print size, what ISO setting would you recommend the small sensor use if f/3.2 yields the exact same DoF, diffraction and signal-to-noise ratio in a like-sized print?

It is well known that a large sensor camera can emulate a small sensor camera, while a small sensor camera can't always emulate a large sensor camera. There is nothing new in your example.

You would have to reduce the ISO at the small sensor by five stops - from ISO 100 to ISO 17.7 (coincidentally) - still shooting at f/3.2, to match the shutter speed had with ISO 100 at f/17.7 on the large sensor.

Do you have any idea how much 5 stops is?

You would have to reduce the ISO to approx. 3, not to 17.7.

Oh, thank you for catching that error.  You're right, the small sensor shooter would have to set the ISO to 3.125 to match the noise level had with IS0 100 on the fullframe sensor.

Thanks for strengthening my argument.

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