MTO = Maksutov Tele-Objective
The design dates from 1958, when two versions were released - MTO-500 and
MTO-1000, with focal lengths readily guessed from the type number!
The optical layout of each can be seen at these links (which refer to the
original 39mm screw mount versions, having a film-flange register of 45.2mm,
for the original Zenit SLR cameras developed from the Leica-copy FED body
design):
http://zenitcamera.com/archive/lenses/mto-500.html
http://zenitcamera.com/archive/lenses/mto-1000.html
--
Piers
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of Jeff Keller
Sent: 22 June 2006 01:25
To: olympus@xxxxxxxxxx
Subject: [OM] Re: 500/5.6 Rubinar / MTO Catadioptric lens
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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