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Re: [OM] long telephoto advice

Subject: Re: [OM] long telephoto advice
From: Tom@xxxxxxxxxxxxx
Date: Wed, 12 Jun 2002 17:46:36 -0400
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
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