Archived posting to the Leica Users Group, 1996/07/25
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>Someone, I can't remember who, posted a table showing maximum f-stops for
>focusing accurately on an m2,m6 etc.
>
>The table showed for a 90mm lens on a M6 a f-stop of 2.1.
>
>My question, if you can't focus a 90mm summicron accurately wide open, then
>why do they make the lens - it doesn't make sense to me.
>
>Should I consider trading my summicron (I have noticed that I have difficulty
>focusing it) for an elmarit, it would be lighter and smaller!
>
>David Feldman
>
>What the table indicated is that, when focussing at F2, the M6 rangefinder
cannot ensure sharpness at 0,03mm or less for every photo made. You may be
within the 0,03mm, you may be somewhat beyond. The matter could now and then
result in pictures that are slightly less sharp. You will see this only on
big enlargements however, not at the size of the usual drugstore print. At
F2.8 and smaller, sharpness will be perfect. Don't throw away your 90 mm
Summicron.
Gerard Captijn,
Geneva, Switzerland.
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