A few words on Equivalence and comparing systems

Started Apr 2, 2013 | Discussions thread
69chevy
Senior MemberPosts: 1,532
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Re: Please...
In reply to Great Bustard, Apr 3, 2013

Great Bustard wrote:

69chevy wrote:

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.

...read the OP.  It's all discussed there (and yes, diffraction and exposure are discussed).

I did.

You can compare diffraction between two cameras with the same entrance pupil and different sensor sizes, but not with different flange distances and sensor sizes. This is where your equivalency formula falls short.

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