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
James N. McBride wrote:
> I had a Spiratone 400mm and it was a camera lens and not a spotting scope
> format. I think most of their lenses used the t-adapter. /jmac
>
> -----Original Message-----
> From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx]On
> Behalf Of Chuck Norcutt
> Sent: Wednesday, June 21, 2006 2:20 PM
> To: olympus@xxxxxxxxxx
> Subject: [OM] Re: 500/5.6 Rubinar / MTO Catadioptric lens
>
>
> I found this a bit confusing. I well remember Spiratone and bought a
> fair number of things from them in the late 60's and early 70's. I also
> remember the Russian MTO and also the stories that the Spiratone 500
> mirror lens was, in fact, an MTO lens.
>
> What confuses me is your comment about adjusting the mirror to move the
> back focus out to make it suitable for an SLR. The implication is that
> the MTO is a spotting scope rather than a camera lens. Maybe you're
> right but I remember the MTO and Spiratone 500's as T-mount lenses and
> thus designed for SLR use from the get-go.
>
> OK, all you oldies out there (most of you except Ali), which of us is
> correct?
>
> Chuck Norcutt
>
> << snip
>
>
>
>
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