I have posted here
<http://www.chucknorcutt.com/MLP/Mirror%20lens%20performance.pdf> what I
think are the same data Moose presented except that I have them in a
much more readable format. Actually, I'm not sure where I found the
original data but laboriously entered it all into a spreadsheet and then
produced a PDF from that.
I think if you review the data you'll find not much agreement with what
you've said below. The Zuiko actually has quite good resolution and has
far superior contrast to all of the other contenders. The Vivitar
solid-cats, on the other hand, actually perform quite poorly. They're
the lowest on the list in resolution and also very near the bottom of
the pack in contrast.
The Questar, Honeywell and Celestron are superior to all the others in
resolution but still lag well behind the Zuiko in contrast. They are
also quite different animals from the 500/8 lenses. They're proper
telescopes and are significantly larger and heavier. And I don't know
where you'd actually get a Questar 700/8. The only Questars I've ever
seen or heard of are 3.5" or 7" Maksutov telescopes with focal ratios
closer to f/15 than f/8. Even the little Questar sells for $5,000 or
more. If you really want a 500/8 mirror lens the Zuiko is actually a
pretty good choice.
Chuck Norcutt
On 4/22/2015 10:43 AM, Sawyer, Edward wrote:
I have contemporary scans of various lenses, incl. the OM 500/8 and other
mirror lenses, scanned from Modern Photo, Pop Photo, and other sources
here:
http://www.edsawyer.com/lenstests/
The OM was ok, but not outstanding. None of the reflex lenses were really
anything special except the 750mm Questar, which was the best of the
reflex lenses.
The Vivitar Series 1 solid-cat lenses are worth looking at too, those are
probably 2nd best to the Questar, and came in a few sizes/lengths. The
450mm one is probably the one to look at closest, it¹s very light and
pretty well regarded.
The 250mm Rokkor mirror lens is *stupidly* overpriced, avoid it unless you
can find it for $250 or so. I don¹t know what the fetish about that one
is. Certainly not image quality, from what I have seen. The rokkor 58/1.2
is worth what it costs, it¹s a fantastic lens, image-quality wise.
250/5.6 reflex - Not so much.
-Ed
On 4/22/15, 6:16 AM, "olympus-request@xxxxxxxxxxxxxxxxx"
<olympus-request@xxxxxxxxxxxxxxxxx> wrote:
Re: [OM] opinions of the OM 500mm F8.0 reflex lens?
Message-ID:
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