I bought an old Novoflex bellows and I'm trying to find the right adapter for it.

Can somebody identify this mount? The opposite end is a 39mm Leica screw mount.

Bellows camera mount Bellows profile

The collar rotates ~40° or so (almost a quarter turn). It appears to be a locking mechanism. At first I thought it was the old Canon FD mount. It's similar, but slightly smaller in diameter, and with smaller lobes. I only know this because I bought an FD→EOS(EF/EF-S) adapter, and it didn't fit.

Here's the other end and some adapters that came with it (marked MINA & IXA):

Bellows lens mount

Adapters camera mount Adapters bellows mount

  • \$\begingroup\$ Just for clarity purposes, it looks to me that the photographed end mates to the camera, not the lens. Is that correct? \$\endgroup\$
    – scottbb
    Commented Oct 1, 2017 at 16:16
  • \$\begingroup\$ Is the 39mm end male (like a Leica lens) or female (like a Leica camera)? \$\endgroup\$
    – Michael C
    Commented Oct 2, 2017 at 3:15
  • \$\begingroup\$ @MichaelClark I don't know. It has an internal thread. So.. female, I guess? Is that useful information? \$\endgroup\$
    – voices
    Commented Oct 2, 2017 at 3:18
  • \$\begingroup\$ @scottbb That's right. \$\endgroup\$
    – voices
    Commented Oct 2, 2017 at 3:20
  • \$\begingroup\$ @tjt263 Yes. It was another way of asking what scottbb asked a few hours ago and never got a response until just now. \$\endgroup\$
    – Michael C
    Commented Oct 2, 2017 at 3:25

1 Answer 1


This is appears to be a breech-lock mount. Breech-lock mounts visually appear to be just about the opposite of bayonet mounts. In typical bayonet mounts,

  • The camera body has slots to receive a cylinder with tabs (from a connector standpoint, it is "female");
  • The lens has an extended cylinder with multiple locking tabs protruding from the end of the cylinder (i.e., "male").

In breech-lock mounts,

  • The camera body has a cylinder extended from the mounting flange, with locking tabs protruding from the cylinder;
  • The lens receives the cylinder and tabs. Rather than rotating the lens onto the camera body like bayonet mounts do, the lens and camera mating surfaces do not rotate with respect to each other. Usually, the lens has a rotating collar to lock the mounting tabs. The Canon FD mount was a breech-lock mount that originally had a rotating locking collar. Later FD lenses, marketed as New FD lenses, did not have a rotating locking collar. Instead, while the lens's mating flange did not rotate, the rest of the lens (body, glass, internal mechanisms) rotated.

There are a few existing questions related to breech-lock mounts here:

As far as which breech-lock mount this is, there is a thread at pentaxfourms.com trying to identify what appears to be the exact same Novoflex bellows with the same mount. They didn't conclusively identify the mount, but speculated it might fit a Canon 7 rangefinder camera. The Canon 7's mount could accept Leica M39 lenses with its internal threading, but the exterior of the mount was designed to accept their 50mm ƒ/0.95 lens, and their Reflex Housing 2 (which effectively turned the rangefinder camera into a SLR).

Canon 7 rangefinder camera
Canon 7 rangefinder body. Note the bayonet tabs to accept a breech mount lens. Image from KEH.com, for educational purposes under fair use.

Edit after addition of MINA and IXA adapters to the question:

The two adapters, labeled "MINA" and "IXA", add a lot of information to the identification. If you search for "Novoflex MINA" and "Novoflex IXA", you'll find that they are Novoflex's terms for "Minolta adapter" and "Exacta adapter".

Novoflex used to produce a line of lenses, Novoflexar, using what was called the Novoflex A-mount (not to be confused with the modern Sony/Minolta A mount). These lenses were breech-lock mounts. The Novoflex BAL-U bellows unit, which yours probably is, used their A-mount.

While Novoflex no longer produces those lenses, or the BAL-U bellows, they still produce adapters to mount those lenses on modern camera bodies. All you need is the appropriate Novoflex A-mount–to–whatever body you want to mount on the bellows. These adapters are listed at Novoflex's site.

They don't provide good descriptions of the adapters, but you can get their part name for your desired mount, and usually find the adapter (and good product images) at places like B&H Photo Video or Adorama.

Below are two example Novoflex A-mount adapters, to Canon EF and Nikon F mounts:

Novoflex CANA-AF adapter Novoflex NIKA adapter
Novoflex CANA-AF (left) and NIKA (right) adapters to mount Novoflex A-mount lenses onto Canon EF and Nikon F mount bodies. The visible tabs are the Novoflex A-mount tabs. Images from B&H Photo Video (CANA-AF, NIKA), for educational purposes under fair use.

  • \$\begingroup\$ The lens receives the cylinder and tabs. Usually the lens has a rotating collar to lock the mounting tabs, rather than relying on rotating the lens to lock the tabs. Not necessarily. The Canon FD was made both ways. With earlier examples only the collar rotated, with later examples the entire lens rotated. Either version would work on any Canon FD mount camera. \$\endgroup\$
    – Michael C
    Commented Oct 2, 2017 at 3:27
  • \$\begingroup\$ @MichaelClark I decided to go full-commitment on the breech == rotating locking collar. Later FD lenses without the lock collar are usually referred to as bayonet, from what I can tell. What that distinction, then theoretically there's no reason a camera body couldn't be made with a locking collar to accept "normal" (Canon EF, Nikon F) bayonet tab lenses so that they wouldn't rotate. In that case, it would be a breech mount. \$\endgroup\$
    – scottbb
    Commented Oct 2, 2017 at 3:44
  • \$\begingroup\$ @MichaelClark hmm... I'm not sure I agree with you on New FD = breech. Let me do some research, and I will certainly address it. \$\endgroup\$
    – scottbb
    Commented Oct 2, 2017 at 3:45
  • \$\begingroup\$ @MichaelClark Okay, after some more reading, I think I've found the distinction: in a bayonet mount, the mounting surfaces side past each other. In a breech-lock, the mounting surfaces do not rotate with respect to each other. The mounting face of the New FD lenses did not rotate on the camera body. In essence, the entire lens, less the mounting flange plate, was the breech-lock mechanism. So I agree with you, New FD == breech. But I disagree that breech = female, bayonet = male. \$\endgroup\$
    – scottbb
    Commented Oct 2, 2017 at 3:58
  • \$\begingroup\$ Let us continue this discussion in chat. \$\endgroup\$
    – scottbb
    Commented Oct 2, 2017 at 4:07

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