Detecting uncoded lenses?!

[dante]

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My M8 recently came back after work (not identified by Leica) to correct some focus problems. Leica left "lens detection" on. I tried a bunch of coded lenses and then an uncoded 90 Hexanon. To my great surprise, the Hexanon registered as a 90mm on the info screen for shots taken with it, despite the lack of coding on the lens. What gives? Is the camera reading solely from the framline lever?

[jaapv]

No- the lens probably has a screw - or a smudge- exactly in the right spot on the mount.

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[guidomo]

I think others have reported this before. Supposedly a screw happens to be just in the place where the corresponding 6bit code has a "1" (black dot). Call it luck, if it works consistently that saves you the coding.