39mm screw lenses

The 39mm screw mount was introduced by Leica with the model I (C), and used on all the Leica models until the IIIg. The mount was adopted on many Leica copies and other 35mm rangefinder cameras.

The mount is also called Leica Thread Mount (LTM), Leica Screw Mount (LSM), or M39. It is 39mm diameter and 26 threads per inch, with rangefinder coupling.

The most important bodies using the 39mm screw mount are:

• Leica I/II/III
• Canon rangefinders
• Voigtländer Bessa
• the Russian Fed, Zorki, Leningrad and Drug
• the British Corfield Periflex

Some makers made cameras and lenses with a 39mm screw mount completely incompatible with the Leica one, because the flange-to-film distance is different. Two such systems are:

• the Braun Paxette
• the Russian Zenit, first models

We can attempt to make a list of 39mm screw lenses from the most important makers.

Russian lenses

From FED or KMZ

Voigtländer lenses

• From the original company
• From the Cosina period

Zeiss lenses

Quite rare

Nikon lenses

• 50/1.4 Nikkor-S
• 50/3.5 Nikkor-QC collapsible

Berthiot lenses

• 28/3.3 Angulor

Steinheil lenses

Steinheil made some lenses in M39 mount. It was essentially the optical range developed for their own Casca model. They were all in chrome finish.

• 35/4.5 Orthostigmat
• 85/2.8 Culminar
• 135/4.5 Culminar

Steinheil also made lenses for the Braun Paxette, with a 39mm diameter screw mount, not compatible with the Leica rangefinder because the flange to film distance and rangefinder coupling were different.

Corfield lenses

Corfield sold a range of lenses with their Periflex 39mm mount bodies. The Periflex had no rangefinder but a periscopic through the lens focusing system, so it seems that none of the lenses was rangefinder coupled. Some lenses were made in collaboration with Enna, and the last ones were probably entirely made by Enna.

The known finishes were:

• type 0: all chrome, only on the first 50/3.5 Lumar
• type I: chrome and leatherette
• type II: black with wide chrome stripes (like the Enna lenses of the same period)
• type IIb: black with thin chrome stripes and one chrome ring

• 35/3.5 Retro-Lumax (I)
• 45/1.9 Lumax (I)
• 45/2.8 Lumax (I)
• 45/3.5 Lumax (I)
• 50/3.5 Lumar, 1953 (0)
• 50/3.5 Lumar-X, 1955 (I)
• 50/2.8 Lumax (II)
• 50/2.4 Lumax (II)
• 50/1.9 Lumax (II)
• 100/4 Lumar, 1957 (I)
• 135/3.5 Tele-Lumax (I)