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Started Sep 27, 2013 | Discussions thread
Sean Nelson
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Re: 35mm Film is somehow optimal for digital sensors?
In reply to brianric, Oct 1, 2013

brianric wrote:

Big Ga wrote:

A Q then. Why bother lugging around the very large and very heavy 24-70 when you could use say a 24-85 3.5-4.5 or whatever it is which is a fraction of the size/weight? (and probably around half the cost of the 12-40 olympus and probably not THAT far off the same weight either - bet its less than 100g difference, and the nikkor will effectively be faster since the 12-40 is going to be an equivalent 24-80/5.6))

We're not talking DOF, so please explain exposure wise how an Olympus f2.8 lens is an equivalent to a FF 5.6 lens.

It's equivalent in the sense that, for a given generation of sensor technology, pictures taken at the same shutter speed in low light with an M43 f/2.8 lens are just as noisy as those taken with a FF f/5.6 lens using a higher ISO to compensate for the difference in aperture.   You can think of it as "noise equivalence".

That's the theory, anyway.   In practice the actual gap in performance between M43 and FF seems to be a little less than a full 2 stops.

However that "equivalence" really only applies when you get down into light levels and enlargement ratios in which the noise becomes a factor in the quality of the final image.   If you're not shooting in those conditions (or if you don't care about the noise) then it doesn't really matter.

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