Quote:
Originally Posted by brianv
My 1954 9cm F4 Elmar has the button on the side, it is the collapsible lens. To me used properly, the lens has to be extended and the button pressed to focus.
If that sounds like what you have, post back. If it's still confusing (it was to me!), I can post some pictures.
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Right... I forgot there is ONE 90 with a unlocking button...
