A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
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Re: A few words on Equivalence and comparing systems
In reply to Ulric, Apr 3, 2013

Ulric wrote:

Macx wrote:

Oh definitely, but my argument was that the "f/2.8 is f/2.8", implying that the exposure value of two f/2.8 lenses are the same regardless of their physical aperture, would become less popular.

Since that is actually correct, it would be unfortunate if it became less popular.

Keep in mind we're talking about comparing lenses on different systems. We'll get different depth of field, different diffraction, different levels of shot noise. Sure, it'll produce the same amount of brightness in the jpeg, because that is what the "ISO" is set up to deliver, but if you're shooting raw, would you care that much? No, you'd be more interested in the DoF and optical qualities and about maximising exposure, and thus the statement that "f/2.8 is f/2.8" would be less relevant, and thereby less popular.

What I would like to throw out is ISO. The photographer shouldn't have to twiddle that knob.

I agree, "ISO" should be replaced with something suited the digital reality.

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