Focal length 35mm equivalent, but not F-stop?

Started Jul 24, 2014 | Discussions thread
Erik Magnuson Forum Pro • Posts: 12,247
Re: Focal length 35mm equivalent, but not F-stop?

Beachcomber Joe wrote:

Trying to massage numbers to render all the variables the same is a fool's errand.

It's quite easy with digital: apply the crop factor in stops to both f-stop and ISO.

If DOF matters, you might use a DOF calculator -- which will give you get the exact same answer as using the crop factor  (assuming same distance, AOV, output size) . If noise vs. shutterspeed matters, you (or the camera) will end up adjusting ISO to get the same result.

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Erik

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