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[OM] Re: 500/5.6 Rubinar / MTO Catadioptric lens

Subject: [OM] Re: 500/5.6 Rubinar / MTO Catadioptric lens
From: "Jeff Keller" <jrk_om@xxxxxxxxxxx>
Date: Wed, 21 Jun 2006 17:25:01 -0700
Hmmm ... I don't remember seeing any 500/5.6 lenses before I came across the
MTO / Rubinar. It sounds like the back end of yours is much different. Does
it have the heavily curved front meniscus lens of a Maksutov or the
relatively flat front lens of a Schmidt-Cassegrain?

-jeff

-----Original Message-----
From: Chuck Norcutt
Sent: Wednesday, June 21, 2006 4:50 PM
To: olympus@xxxxxxxxxx
Subject: [OM] Re: 500/5.6 Rubinar / MTO Catadioptric lens

But the 400 was not a mirror lens.  Mirror lenses are quite common in 500mm
spotting scopes.  I have one from Adorama which is the same as sold by Orion
Telescopes.  But it comes with a T adapter so that it can be used on camera
as well.  It's a 500/5.6.  Not a bad spotting scope but the large secondary
mirror (needed for f/5.6) doesn't make for much contrast.

Chuck Norcutt

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