: It's not possible to test performance at infinity by using an extension
: between lens and body. The focusing scale would say "infinity", but that
: scale is only correct when the lens is used without extension. The testing
: done would actually be for some other reproduction scale. Still somewhat
: relevant for our old lenses, but nearly useless for lenses with internal
: focusing.
:
: There are two ways I can think of that would make testing at infinity
possible:
: a) Parallell incoming rays, checking point size in focal plane.
: b) Point source in focal plane, checking the spreading of the light bundle
: coming through the lens.
According to http://www.photodo.com/art/Unde7.shtml they've done all their
testing on 'Hasselblads Ealing MTF equipment'. Does anybody know what this
is? Some kind of optical bench, I suspect?
hnz
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