> 50mm lens is quite ok as a loupe. It allows you to see the whole > negate/slide at once, unlike shorter lenses. Taking the front > element? Why? You would probably end with extremely low power loupe > with a lot of spherical and chromatic aberations. Just use the whole > lens - that's what it was corrected for, after all! camera lenses > make highly corrected loupes. > > However, you need at least 1.4 aperture to be able to see a whole > 35mm frame at once. With 1.7, you won't be able to see it all.
Thanks for the info, I can't see me using an f/1.4 though - little expensive :) Any idea of the magnification using the full lens? John
