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RE: filmscanners:Focusing & film flatness



> So the question is, are the lenses in film scanners flat field, or are
> they
> slightly dished to accomodate film curvature?  Or are some small apeture,
> high
> depth of field lenses working with more sensitive ccds. 
>

Kodak and others used to make projection lenses with field curvature
designed to match the expected curvature of cardboard mounted slides.
Worked well unless the slide was reversed or mounted in glass.

It would be worthwhile to reverse the film in a scanner showing insufficient
depth of field (a.k.a. the recent Nikon 4000 review).  If the field
curvature of the lens looks like ) but the film looks like ( then reversing
the film would make both look like ).  






 




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