Yes, it's a breech-lock mount. 

Godfrey


On Feb 10, 2014, at 12:38 PM, Charles Robinson <charl...@visi.com> wrote:

>> On Feb 8, 2014, at 20:50 , CollinB <coll...@brendemuehl.net> wrote:
>> 
>> Got a Canon 7 rangefinder today.  Never had one before.  
>> Can't figure out how to remove the lens. 50/1.4
>> Might be nice to try with a m39 adapter.
> 
> According to this:
> 
> http://www.cameramanuals.org/canon_pdf/canon_7_bell_&_howell.pdf
> 
> There is a silver "bayonet tightening ring" close to the body which needs to 
> be rotated counter-clockwise to release the lens.

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