Re: 50mm Rigid Summicron or 50mm Summitar for M8?
My guess is that you would get more or less the same 'glow' (medium contrast plus irradiation) with the Summicron, as the distance in time is not too great. And the 'cron is certainly more convenient.
Re collapsible lenses: Leica say that no collapsible lenses except the (just discontinued) 50mm 2.8. Elmar and the current Macro-Elmar may be used. In the case of the old collapsible 90mm 1:4 Elmar it is even true! In all other cases I know of (collapsible 50mm Elmar 3.5 and 2.8, Summitar) the reason is that Leica fear that they will be blamed if somebody mounts or dismounts a collapsed lens askew, and manages to scratch or dent something inside, probably the little meter cell deck-house. So don't do that! Mount or remove a collapsible lens only in the extended state, and you should be safe, even if you collapse it on the camera afterwards.
How it is with the collapsible Summicron I do not know. Has anybody tried it?
The old man from the Age of the 3.5 Elmar
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