Archived posting to the Leica Users Group, 1997/05/14
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On 14 May 97 at 8:28, David Young wrote:
> I bought the MTO, despite it's bulk, because of the superior performance,
> reasonable price tab and the funky wooden case it came in (complete with 4
> - 77mm filters!).
You mean real wood, as in those things with branches and leaves?!?
Never seen boxes like that.
They probably ran out of cardboard....;-))
> Three questions, for those who are still reading...
>
> [1] Though engraved as a 500 f8 on the lens, the addendum sheet with it
> says it's a 548mm f8.8. Is this sort of variation normal?
I believe both ISO and DIN allow 10% deviation either way. Well within
spec....;-))
If not, then it is fully compliant with a Russian certification....:-))
Related detail: the spec's for the Horizon 202 panorama camera are
more honest than for the German Noblexes. The Horizon lists a
horizontal and vertical angle of view separately, all Noblexes only a
diagonal angle.
PS: for those interested in more panorama spec's, and a link to the
Noblex site (Marc, I think you might find some interesting stuff on their
site too), check my homepage:
http://www.a1.nl/phomepag/markerink/mainpage.htm
> [2] All three lenses, as well 500/8's by Minolta, Leica, Nikon and my
> 1000/11 Celestron all focus to beyond infinty. Does anyone where know the
> reason Mirror lenses do not have an infinity stop?
To compensate both both temperature expansion/contraction and sloppy
adaptors. On some cameras with build-in flash this comes in quite
handy, as you must turn the M42 adaptor loose to clear the prism.
> [3] The MTO rsults were virtually as good as the Nikkor's or Celestron's.
> Yet the booklet lists resolution as "Central - 32 lines/mm" and "Peripheral
> - 20 lines/mm". The MTO seems much better than such numbers would
> indicate. Can anybody tell me why?
I believe this is common for many Russian lenses, glass lenses
included.
- --
Bye,
Willem-Jan Markerink
The desire to understand
is sometimes far less intelligent than
the inability to understand
<w.j.markerink@a1.nl>
[note: 'a-one' & 'en-el'!]