I thought there were only three types of M39x1 lens mounts: M39x1/28.8 (Leica rangefinder), M39x1/45.2 (Зенит/Zenit SLRs), M39x1/27.5 (Chaika half-frame camera series).
But there is another M39x1 lens mount. It was used on the Braun Paxette II (uncoupled rangefinder) and Super Paxette II (coupled rangefinder) 135 film cameras from the 1950s (see 1 and 2), and the latter Braun Super Paxette 35 (from the 1960s). The same mount was also used on the Neidig/DeJUR/Bower cameras.
A special feature of the M39x1 Paxette mount is the rather large (for a rangefinder camera) flange focal distance (FFD): 44mm, like the Praktiflex M40x1 mount. But the SLR Praktiflex needs it for the mirror, while the Paxette has it due to the Pronto leaf shutter (instead of a focal-plane shutter).
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It is interesting to use the lens for the Paxette on modern cameras. There are several possibilities, I will show the main ones (for the Sony FE/E mount) using the Staeble-Telexon E 85/5.6 lens (by Staeble-Werk for the Paxette).
1. Using a M39x1-M42x1 ring:
This is a commonly available adapter ring. You can then mount the lens on a regular M42x1 adapter (for Sony FE/E in this case).
The first problem is that such a [correct] adapter has a flange focal distance of 45.5mm instead of 44mm. The lens will not focus to infinity. If possible, you can try to reduce the length (thickness) of the adapter.
The second problem is that some lenses for the Paxette have a protruding rear end.
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If you use such a lens on an SLR through a M42x1 adapter, the mirror may hit the back of the lens.
2. Adapter from M39x1/44 to M39x1/28.8 (Leica).
Ideally you need a M39x1-M39x1 tube with a length of 44-28.8=15.2mm. This is a rare item, but there have been both mass-produced and homemade ones.
I happen to have a M39x1-M39x1 tube that is exactly 15.2mm:
I use it with the M39x1-Sony FE/E adapter:
If you don't have a 15.2mm M39x1 tube, you can use one or more M39x1 extension tubes or "helicoids" or bellows that are close to 15.2mm long (or slightly smaller).
For example, three 5mm M39x1 extension tubes can be used.
The total length would be 15mm with focusing slightly beyond infinity:
This works with this Telexon. But the 5mm tube has a rather short thread, so some Paxette lenses cannot be screwed in completely.
3. Using a M39x1-M42x1 ring and a thin M42x1 adapter.
In this case, you need to compensate for the difference in focal flange distance with M42x1 extension tube(s) or helicoid or bellows.
For example, with the 5mm adapter (for Sony FE/E):
7mm and 14mm M42x1 extension tube(s) are used in this case.
18mm (Sony FE/E FFD) + 5mm (adapter) + 14mm + 7mm = 44mm (Paxette FFD).
All three options:
See also related notes:
- Zenit-3M: M39x1/45.2 SLR (2025-08-29)
- Staeble-Kata E 45/2.8 and Staeble-Telexon E 85/5.6 (2024-07-11)
- Staeble-Kata E 45/2.8 (M39x1/44): Standard triplet for Braun Super Paxette II (2024-06-24)
- Thread mount adapters for M39x1 (2024) (2024-06-12)
- Leica M-M4/3 adapter (2024-05-12)
- Staeble-Telexon 135/3.8 (M39x1/44): The lens for the Braun Super Paxette II (2024-03-26)
- Staeble-Werk Choro R 35/4.5: Lens restoration (2024-02-03)
- M39x1-Samsung NX adapter (another one) (2024-01-29)
- Braun Super Paxette II BL: Film rangefinder camera (2024-01-13)
- Staeble-Werk Choro R 35/4.5: My experience [3/3] (2023-12-13)
- Staeble-Telexon E 85/5.6: My experience [1/3] (2023-11-07)
- Staeble-Werk Choro R 35/4.5 (M39x1/44): Very rare wide-angle triplet (2023-10-05)
- Staeble-Telexon E 85/5.6 (M39x1/44): Telephoto lens for [Super] Paxette II (2023-09-27)
- Использование объективов M39x1 на цифровых камерах (2022-05-18)
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