Dan Mitchell wrote:
> chucknorcutt@xxxxxxxxxxxxxxxx wrote:
>> A Zuiko 50/1.8 (mount end toward film) makes a superb 5X loupe.
> > For magnificaton of other lenses as a loupe divide 250 by focal length.
>
> Just curious -- where does 250/length come from? Why is 250 the magic
> number here? It doesn't seem to be a number that I'd expect to "fall
> out" of optics, but I must be missing something.
>
> -- dan
I'm curious where that number comes from as well?
Darin
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