Help needed with Voigtlander ultra wide hellar 15mm M mount not locking on M6ttl

[nelly]

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I have a Voigtlander 15mm ultra wide hellar M mount lens which mounts fine on my M9 and clicks as it locks

but on my M6ttl. It will not click and lock into position.

All my other Leica Lenses mount fine on my M6 and click into locked position easily.

 

Has anyone encountered this problem or has any suggestions

Posted this in the film forum also but may be more relevant here

Thanks Neale

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[nelly]

Problem solved

Cleaned the lens mount and checked the camera lens mount to see if any screws could be tightened and success the lens locked in place. I guess the lens tolerances must be very temperamental.