Is my 111f lens a Leica thread mount / LTM / M39 / L39

[splaaash]

Ive always called lenses that screw on to my 111f or 11c "screw lenses"

Ive seen them called LTM & 39mm But wondered if "M"39 referred to an M leica🙁 In the past i simply wondered, now i thought id ask😱 What are screw lenses called

Another question ive seen Leica M 35 f3.5 screw,and M35 f3.5 which was M mounting but looked like a screw in the images.Since it said for Leica M i left it
I also read that Leica M 35mm are not as good as Leica 35mm ones😱🙄:bang:

 

[Pete B]

M39 refers to an SLR mount (e.g. old Zenit cameras). I think the "M" stands for metric.
For your 111f you need LTM (Leica Thread Mount) or L39 lenses.

I've noticed some eBay sellers don't know the difference between M39 and L39 and incorrectly label LTM/L39 lenses as M39.
Pete

 

[splaaash]

OK that seems clear.By now all lenses on ebay are over priced,in the past i wanted to by a 35mm Elma collapsible but they always said M and in the description... for M
Unfortunately the sellers knew nothing about the lens beyond it being Leica & so valuable. When asked they would say for Leica

My Industar & Jupiter are both LTM lenses then?

 

[View Range]

The Leica thread mount is 39mm diameter x 26 threads per inch; the flange is 28.8 mm from the film plane. All three of these values have to be correct. Neither Leica thread mount nor Zenit is M39, which would be 39mm diameter x 1mm thread pitch or 39mm diameter x 0.75 thread pitch (Compur 1 rear outer mount). The diameter can't be directly measured with a caliper because machining the thread changes the final diameter. The pitch is hard to measure with a thread gauge because 1mm pitch and 26 threads per inch are very close.

 

[Rob-F]

T once screwed my 50mm LTM Elmar into a friend's Pentax. the lens seated OK and I used it to shoot some macro shots. Of course it didn't focus to infinity or any distance beyond the macro range.

 

[VictorM.]

The '39mm' may refer to the filter thread dimension on later versions of ltm lenses.

 

[Particular]

My Industar & Jupiter are both LTM lenses then?

They are in the sense that they are made to be compatible, although the Soviet cameras and lenses use a 1mm thread pitch instead it the imperial pitch that Leica used. They fit, but are slightly different.
The rangefinder calibration is also slightly different on the Soviet lenses, which is why for critical purposes some people like to get them shimmed.

 

[splaaash]

I wondered why my Sony NEX / Leica screw adapter jammed with my Jupiter lens first turns work but i never screwed it fully in

But on my 111f and 11c the Jupiter fits perfectly😕 The indastar ridged dosnt fit though

 

[Red Robin]

I understand the Russians changed the thread pitch slightly after they ran out of Leica parts. Others surely know more of this than I. Old posts by Raid perhaps He's done some great lens studies.

 

[Scrambler]

They are in the sense that they are made to be compatible, although the Soviet cameras and lenses use a 1mm thread pitch instead it the imperial pitch that Leica used. They fit, but are slightly different. The rangefinder calibration is also slightly different on the Soviet lenses, which is why for critical purposes some people like to get them shimmed.

This has been thrashed out before. The Soviet lenses are theoretically fully compatible for thread but in practice aren't always. I have an Industar 61L/D lens that won't fit my many and varied adapters nor my Leica 111c, but my other Soviet lenses (j-12, J-8, J-3, I-50) all do. My other LTM lenses fit the FED-2 that the I-64 also fits. My conclusion is that the pitch varies a bit but that the thread depth in the camera was made to cope with that variability. Only the very first Pre-Canon Japanese RFs used a 1mm pitch thread.

 

[David Hughes]

I understand the Russians changed the thread pitch slightly after they ran out of Leica parts. Others surely know more of this than I. Old posts by Raid perhaps He's done some great lens studies.

Hi,

I don't think they ever had Leica parts; perhaps you were thinking of Contax parts which they claimed from Germany as compensation for the destruction in 1941(?) of their camera factories.

Regards, David