Archived posting to the Leica Users Group, 1997/05/01

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Subject: Re: 500mm Mirror Lenses (partially off topic)
From: Willem-Jan Markerink <w.j.markerink@a1.nl>
Date: Thu, 1 May 1997 12:12:43 +0000

On 30 Apr 97 at 23:29, Marc James Small wrote:

> A Russian 8/500 or 6.3/500 MTO can be had for under $200.  Some of these
> have T-mounts, while others require the substitution of the outer ring of a
> T-mount adapter for the M42 ring on the lens.  Either way, these are nice
> lenses at bargain pricing.

I vaguely recall that there are three Russian 500mm's, with the
500/5.6 more known than the 500/6.3. Might be the same basic lens,
but one rated in F-stop (measured at 500/overall diameter) and the
other rated in T(ransmission)-stop (measured at 500/effective
diameter [sans donut]).
Note that there is also a nice 300/4.5 Russian mirror available. 
Probably will buy one some time for infrared photography....no 
fussing with IR-correction....:-))
Btw Marc, have you successfully mounted one of those on a Leica R 
body? Since all these lenses are M42-mount, they officially shouldn't 
fit (R-register is larger than M42-register), but slop beyond 
infinity and being a tele might compensate for that.
Do *thin* M42->Leica-R adaptors exist at all?
(ie sans optical correction elements)




 
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Bye,

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      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@a1.nl>
[note: 'a-one' & 'en-el'!]