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.
>
http://en.wikipedia.org/wiki/Magnifying_glass
The formula Chuck gives is a simpler version of the second formula in
the article. It combines the diopter and power calculations into one.
Moose
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