On Wednesday, June 12, 2002 at 8:33, Winsor Crosby
<olympus@xxxxxxxxxxxxxxx>
wrote re "Re: [OM] long telephoto advice" saying:
> >Cross off the "evenly lit" part and you'd be right.
> >
> >Tom
>
> I just saw an example of a shot in one of the TOPEs and I see what
> you mean. The previous shots I saw must have had the dark corners
> cropped or the subject matter did not call attention to it. I wonder
> if it is worse than other mirror lenses.
>
> Gary Reese's sample of the 500/8 rated an "A" for vignetting which
> way better than most lenses wide open. Hmm.
True, but "wide open" is f/8 with the mirrror!
He says "vignetting: none" with the 600 & 1000.
Only some wide angles <=28mm have less than A vignetting at f/8, it
appears. (I'm assuming a single score for vignetting applies to wide open
only, and unmentioned apertures are at least as good as the best mentioned
aperture.) Telephotos have a built in optical advantage avoiding
vignetting.
Tom--
--------- http://groups.yahoo.com/group/Olympus-Documentation
--------- http://groups.yahoo.com/group/ottawa-photo-clubs
tOM Trottier, ICQ:57647974 http://abacurial.com
758 Albert St, Ottawa ON Canada K1R 7V8
+1 613 860-6633 fax:231-6115 N45.412 W75.714
"The moment one gives close attention to anything,
even a blade of grass, it becomes a mysterious,
awesome, indescribably magnificent world in itself --
Henry Miller, 1891-1980
< 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 >
|