William wrote:
> No one has yet explained how a lens can have the
> image-forming rays near the edge strike the image plane at a
> less-acute angle without changing the lens's focal length.
I thought this was accomplished by all wide angle lenses of retrofocus
design, compare the geometry of the 35mm in the XA to the OM 35mm, the
XA has the rear element much closer to the film plane, so the angle the
light hits the film is more acute than that of the OM.
...Wayne
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