A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
69chevy
Senior MemberPosts: 1,330
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Re: Crop factors and Equivalents
In reply to Great Bustard, Apr 3, 2013

Great Bustard wrote:

69chevy wrote:

So...

My camera phone has a crop factor of 7.64, the lens is 3.85mm and the aperture is f2.4.

The FF equivalent is 30mm f2.4?

No -- the FF equivalent is 29mm f/18 (3.85mm x 7.64 = 29mm, f/2.4 x 7.64 = f/18).

No disrespect, but if you are strictly talking DOF, this makes a little sense. If you are talking about diffraction effects or exposure effects it is not true.

Why bother comparing different formats?

Why compare different anything?  That said, there's no point in bringing up Equivalence if you are not comparing different formats.

That was my point, I don't see the point in comparing different formats.

If you use both, you should still know the FOV of all of your lenses from experience.

One would hope that you know more than just the FOV.

That is all you will get from these comparisons, so it is all you need to know to avoid them.

Apples and Oranges if you ask me (which you didn't).

More like V8s and in-line 4s, actually.

Which are also so different that comparisons are of little use. "My Honda has a .3 Corvette equivalence factor"...

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