[Leica] Sum 90 aperture index

["Hans Pahlen" <hans@komvux.skola.mark.se>]

In James Lager's book on lenses (page 202), there are pictures of both
Summicron 90 versions. One (1965) lens closes left to F/22 and the other
(1967) closes right to F/22.
Before the M6 this were trivial differences, but today, using the 1965
version you will have to turn the aperture ring in the opposite direction
that the arrow in the M6 finder tells you to. Well, I can live with that,
although awkward.

- - I just wonder why Leitz produced these different versions. What were the
logical reasons for it in those days?

On the question about the plastic bottom cover: I ripped it off as I
unpacked my camera for the first time. I don't think a preserved bottom
plate will bring in many cents when selling the camera. Used is used, and
wear is inevitable. Among my friends in the local Leica club, there is only
one who keeps the plastic cover, but he loves buying/selling/trading more
than taking photographs, and has different bodies almost every month.
/Hans

>
>I think you will find that the aperture ring turns same way as others for
>max and min stops. The difference is that the dot is on the moving part and
>the scale is on the fixed part so it looks as though it is the wrong way
>round. I had one once and it fooled me at first.
>Mike
>