Older Interchangeable Lenses on the LEICA M5:
The Leica M5 can be used with all bayonet mount Leica lenses, although a small group described overleaf must be returned for modification. All screw mount Leica lenses can be used with the respective bayonet mount adapters. With only FOUR exceptions, all can be used with the camera's selective through-the-lens light meter.
Exceptions:
1) Collapsible Leica lenses must not be retracted into the housing; this will damage the meter cell carrier, necessitating costly repair. To prevent this, a safety strip must be applied to the lens barrel to limits its retraction. You can easily install this safety strip yourself. (there is a photo of this that seems too complicated to do! NOE). These lenses are 50mm:
Elmar f/3.5
Elmar f/2.8
Summar f/2
Summitar f/2
Summicron/f2
Elmar f/4
hector f/2.5
2) Lenses that must be returned for modification before being used with the Leica M5: Consult with your Leica dealer for the closest LEITZ service center.
a) Deep-seated wideangle lenses whose rear elements would damage the meter cell carrier. After modification of the bayonet mount, the cell carrier will remain safely within its recess. These lenses can not therefore be used with the Leica M5 light metering system, but will couple to the rangefinder.
21mm Super-Angulon f/4 in screw mount (only bayonet adapter ring #14097) must be modified, please state "for 21mm"
21mm Super-Angulon f/4, in bayonet mount
21mm Super-Angulon f/3.4 in bayonet mount. Lenses under #2473251 must be modified for M5. lenses above this # need no modification, but can also NOT be used with the light meter
28mm ELMARIT f/2.8, in bayonet mount. Lenses under #2314921 must be modified for use with the M5 rangefinder only. (Lenses above this number CAN be used for light metering as well.)
b) LEICA lenses whose removable viefinder attachments (goggles) butt against the Leica M5 front plate. Lens bayonet mounts and finder attachments must be modified:
35mm SUMMARON f/3.5
50mm SUMMICRON f/2 (DR) with near-focusing range)
After modification, both of these two lenses can be used for Leica M5 light metering.