[EMAIL PROTECTED] wrote:
> Caveat: Due to design constraints (and to save costs),
> lenses are usually designed for a specific film format
> (size of image circle). I do not know of any lens designed
> for 135 format which will fully cover the 4x5 film format.
That's kind of what I'm getting at. You can't simply increase the focal length of a
lens design when going from 35mm to 4x5--there will also be increases in the physical
size of the lens, perhaps especially barrel diameter, in order to achieve an image
circle sufficiently large to cover the 4x5-inch film--or won't there? Not being an
optics engineer, my rather simple "common sense" tells me that increasing the diameter
of the lens may increase the angle of view, even if focal length remains the same. Or
is it the case that the angle of view of a 90mm lens in 35 mm format will necessarily
be roughly the same as the angle of view of that lens's 4x5 equivalent (equivalent in
terms of magnification and depth compression/exaggeration)?
Craig
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