A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
69chevy Senior Member • Posts: 1,617
Re: Crop factors and Equivalents

Great Bustard wrote:

69chevy wrote:


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"...

 69chevy's gear list:69chevy's gear list
Canon EOS 5D Mark III Canon EF 50mm f/1.4 USM Canon EF 85mm f/1.8 USM Canon EF 135mm F2L USM Canon EF 16-35mm F4L IS USM +1 more
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