Rangefinder lens mount

M39 / LTM (Leica thread) mount

Everything about the M39 / LTM (Leica thread): flange focal distance, native lenses, cameras and which adapters keep infinity focus.

28.80 mm

Flange focal distance

39.0 mm

Throat diameter

1930

Introduced

Rangefinder

System type

Lenses in our database

Mount facts#

Leica Thread Mount of pre-war Leicas and Soviet FED/Zorki rangefinders. Adapts to Leica M with a simple ring.

Adapter	Possible?	Flange gap
M39 / LTM (Leica thread) → Sony E-mount	Yes · manual	+10.80 mm
M39 / LTM (Leica thread) → Canon RF	Yes · manual	+8.80 mm
M39 / LTM (Leica thread) → Nikon Z	Yes · manual	+12.80 mm
M39 / LTM (Leica thread) → Fujifilm X-mount	Yes · manual	+11.10 mm
M39 / LTM (Leica thread) → Micro Four Thirds	Yes · manual	+9.55 mm
M39 / LTM (Leica thread) → L-Mount	Yes · manual	+8.80 mm
M39 / LTM (Leica thread) → Canon EF-M	Yes · manual	+10.80 mm
M39 / LTM (Leica thread) → Fujifilm G-mount	Yes · manual	+2.10 mm
M39 / LTM (Leica thread) → Hasselblad XCD	Yes · manual	+10.66 mm
M39 / LTM (Leica thread) → Nikon 1 (CX)	Yes · manual	+11.80 mm
M39 / LTM (Leica thread) → Pentax Q	Yes · manual	+19.60 mm
M39 / LTM (Leica thread) → Samsung NX	Yes · manual	+3.30 mm

A lens can be adapted with simple tube spacers when its flange distance is longer than the camera's. With 28.80 mm, M39 / LTM (Leica thread) lenses can in principle go on bodies with shorter flanges such as Chaika, Pentax Auto 110, Fujifilm G-mount, Samsung NX, Canon RF, L-Mount. Bodies with this mount can take lenses from longer-flange systems such as Hasselblad XPan, Nikon S / Contax RF, Contax RF-mount, Minolta V-mount, Four Thirds, Konica AR, Konica F-mount, Canon FD.

Last updated October 03, 2026 · How we calculate · Sources