Thread in the photo area

Here you will find a list of international photo threads:

Lens thread

A device for connecting interchangeable lenses is referred to as a lens thread or screw thread, regardless of the manufacturer and generally standardized in photography. While bayonet mounts primarily dominate the market today, lens threads are their predecessors. They were mainly used until the 1980s. Even today, the M42 thread offers cost-effective access when it comes to analog SLR photography using high-quality lenses. The flange focal distance is the distance between the film plane and the flange of the lens mount. The dimension may differ between cameras, but always corresponds if the same mount is used.
The manufacturers specify a tolerance of 0.02 mm for the flange focal distance of a camera.

M39 screw thread M39 x 26Gg

Also known as the Leica L-mount, the M39 screw thread was already used in the 1930s in connection with 35 mm cameras. Voigtländer, Leica, Ricoh and Canon, among others, offered cameras with the M39 thread. Even today, it is still possible to find a few lenses with a high quality. The dimension 26G (1/26″ ~ 0.98 mm) for the pitch almost corresponds to the value 1.00 mm in the metric pitch system. This also makes it possible to use the M39 x 1.0 thread.

M40 screw thread

The M40 screw thread is rather rare today and was used in the 1930s and can also be found on the Praktiflex and Praktiflex II cameras, which were produced by Pentacon and Praktika at the end of the 1940s. Today it can still be found on some CCD line scan cameras.

M42 screw thread M42 x 1.0

The standardized M41 screw thread was used, for example, in cameras from Fujica ST, Praktika, Ricoh, Voigtländer and Pentax. It is the successor to the M39 screw thread. At this time, camera manufacturers were not yet attempting to win customer loyalty by using proprietary lens bayonets. Pentacon set the flange focal distance at 45.5 mm in the 1950s. In contrast, a modern Canon EOS has a flange focal distance of 44.0 mm. This is because the Canon EOS is 1.5 mm shorter than the old Pentax or Praktika cameras. Due to the larger bayonet opening of the EOS compared to the thread for the lens, it is necessary to work with an adapter here.

T2 screw thread M42 x 0.75

The T2 is an old Tamron standard. There are a number of adapters for other sizes to T2 and vice versa. There are several applications for which the T2 mount has become the standard. These include telescopes as well as microscopes and diaduplicators.

C-Mount 1″ inch x 32 TPI UN 2A

This is the standard for connections of CCD cameras and lenses that have a standardized connection thread (external thread 1″-32UN-2A on the lens) and a standardized flange focal distance of 17.526 mm.

CS-Mount 1″ inch x 32 TPI UN 2A

Apart from the flange focal distance, it corresponds to the C-mount. However, the flange focal distance itself is only 12.5 mm. The CS mount standard was developed with the desire to enable shorter designs and to find a new standard for this.

Tripod thread DIN 4503 / ISO 1222

1/4" inch (inch) - 20 UNC

This thread is used in a variety of cameras, including viewfinder cameras, 35mm SLRs (also known as DSLRs) and medium format cameras. It is also used in quick release plates and tripod heads.

3/8" inch (inch) - 16 UNC

The use of this thread is common with some medium format cameras and almost all large format cameras. It is also used for most connections between tripods and tripod heads.

Filter thread

There is an internal thread on the lens, while the filter has an external thread. Both threads are beveled and have a flat stop on the outside. As a rule, 1.5 to 2 turns are sufficient for fastening. The "M" stands for the metric measurement in millimeters of the outer diameter, the "x" is followed by the pitch. For lenses, the designation "E "nn is used, whereby the "E" stands for "screw-in thread diameter". Often only the filter diameter is specified, without the pitch, which in most cases is sufficient to clearly determine the filter thread.

Filter thread with 0.50 mm pitch:

M 19 x 0.5 (very rare)
M 24 x 0.5 (very rare)
M 25.5 x 0.5 (very rare)
M 27 x 0.5 (frequent, video)
M 28.5 x 0.5 (astronomy 1.25″ = 31.75 mm tube diameter)

M 30.5 x 0.5
M 34 x 0.5 (very rare)
M 35 x 0.5 (very rare)
M 35.5 x 0.5 (frequent, video)
M 36.5 x 0.5

M 37 x 0.5
M 37.5 x 0.5
M 39 x 0.5 (video)
M 40 x 0.5 (very rare)
M 40.5 x 0.5 (frequent, video)

M 41 x 0.5 (very rare)
M 43 x 0.5 (very rare)
M 45 x 0.5

Filter thread with 0.60 mm pitch:

M 28.5 x 0.60 (astronomy 1.25″)
M 48 x 0.60 (astronomy 2″)

Filter thread with 0.75 mm pitch:

M 25 x 0.75
M 27 x 0.75 (very rare)
M 28 x 0.75 (very rare)
M 28.5 x 0.75 (very rare)
M 30 x 0.75
M 30.5 x 0.75
M 37 x 0.75

M 38 x 0.75 (very rare)
M 43 x 0.75
M 46 x 0.75
M 48 x 0.75 (also Astronomy 2″)
M 49 x 0.75 (frequent)
M 52 x 0.75 (very frequent)
M 55 x 0.75 (frequent)

M 58 x 0.75 (very frequent)
M 60 x 0.75
M 62 x 0.75 (very frequent)
M 67 x 0.75 (very frequent)
M 69 x 0.75
M 72 x 0.75 (very frequent)
M 75 x 0.75 (rare)

M 77 x 0.75 (very frequent)
M 82 x 0.75 (frequent)
M 100 x 0.75

Filter thread with 1.00 mm pitch:

M 86 x 1 (frequently also referred to as C 86)
M 95 x 1 (also referred to as C 95)
M 100 x 1
M 105 x 1 (also referred to as C 105)
M 122 x 1

Filter thread with 1.50 mm pitch:

M 112 x 1.5