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Photo Forum / General Photo Topics / UK Photography / February 2007Lens mount L39 & M39
Are bayonet lens mounts L39 and L39 the same? Thanks for any help John. > Are bayonet lens mounts L39 and L39 the same? > Thanks for any help > John. There both screw, metric 39 x1mm pitch M bayonet Fit is just that >>Are bayonet lens mounts L39 and L39 the same? >>Thanks for any help [quoted text clipped - 3 lines] > > M bayonet Fit is just that thanks Trev silly me! I did mean to say screw lens mounts L39 & M39 are they the same? I must put my mind in gear first before engaging keyboard! Regards. John. >Are bayonet lens mounts L39 and L39 the same? Both have the same thread, however they are two different mounts, because the lens flange to film distance differs substantially. M39 mount was used by the manufacturers of the early Soviet SLRs among others. The lens flange therefore had to clear the reflex mirror. L39 mount was used by Leica and other rangefinder camera manufacturers. There is no mirror box so the lens flange could be placed much closer to the film. M39 and L39 lenses will mount on cameras designed for either mount. However, you will not be able to obtain focus if you use the lenses on the wrong type of camera. In other words, L39 rangefinder lenses will not obtain focus on M39 SLR cameras, except for close macro workand M39 lenses for SLRs will not obtain focus on L39 rangefinder cameras at all. Beware the very cheap M39 to M42 adapters offered on eBay. They are designed to mount M39 SLR lenses on M42 mount SLRs. Any L39 rangefinder lens used with an M39 to M42 adapter on an SLR will only be good for close macro work. thank you tony, great help >>Are bayonet lens mounts L39 and L39 the same? > >Both have the same thread They don't Tony. The difference is slight but real. M39 is 39mm x 1mm, L39 is 39mm x 26TPI.  SignatureJohn Bean >>>Are bayonet lens mounts L39 and L39 the same? >> [quoted text clipped - 3 lines] > >M39 is 39mm x 1mm, L39 is 39mm x 26TPI. Thanks, John. I didn't know that. But between the two of us, I think we have the subject covered. ;-) Thanks again. [SNIP] > M39 lenses for SLRs will not obtain focus on L39 rangefinder > cameras at all. Presumably they could if fitted with an appropriate length extension tube? Not very useful in general though, not being coupled to the rangefinder. Peter >[SNIP] > >> M39 lenses for SLRs will not obtain focus on L39 rangefinder >> cameras at all. > >Presumably they could if fitted with an appropriate length extension tube? Yes, of course. I did not feel a need to mention that. ;-) >Not very useful in general though, not being coupled to the rangefinder. True, however I use an M42 20mm Carl Zeiss Flektogon on my Leica M bodies without problems. Obviously there is sufficient depth of field to cover minor scale focusing errors. >Are bayonet lens mounts L39 and L39 the same? >Thanks for any help M39 is 39mm diameter and 1mm pitch. L39 is also 39mm diameter but is 26TPI (threads per inch) pitch. The difference is small but can (and does) make some lenses difficult to mount on some bodies. In particular most Russian lenses are M39 whether intended for use on SLRs or RF cameras. SignatureJohn Bean |
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