Note the lame effort to stay on topic in the subject.
Playing with Gary Reese's projector evaluation slide I discovered
that having a great lens is only half the battle(not that my lens is
great). Even with great effort it is questionable as to whether you
can achieve best focus on the screen, but in my own case it is so far
from a real projection experience as to be laughable. My old Leitz
Prodovit 250 has auto-focus which is an early design. It depends on
the lens being sharply focused to begin with. The auto-focus then
attempts to reproduce that original focus(not entirely consistently
in my case).
The problem is that turning the lens goes from out-of-focus to
sort-of-focus with no transition. There is no smooth movement from
approximate focus to sharp focus. So even if the lens had a high
potential it is not realized because of the mechanical design of the
projector. In addition, if you are focusing the lens at the
projector you are too far away from the screen to tell whether it is
focused. Binoculars help somewhat.
It would make me question the wisdom of replacing the lens with a
later, improved model.
Do those people with other projectors have similar problems, or are
they solved by later, better designs?
--
Winsor Crosby
Long Beach, California
mailto:wincros@xxxxxxxxxxx
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|