Filter thread on some cameras; also found on some enlarger lenses (front thread of some Schneider Componon-S models).
Found on some vintage cameras and optical accessories.
Equipment and systems: Large Mitutoyo microscope objectives.
Filter thread on some cameras; front thread of some Schneider enlarger lenses.
Front thread of many popular enlarger lenses: Schneider Componon-S 100mm, some El-Nikkor versions. Also filter thread on some compact cameras (Olympus).
Found on some vintage cameras and accessories.
Thread used on some telescope focuser draw tubes and astro accessories.
T-mount / T2 — universal standard for astrophotography, introduced by Tamron in the late 1950s. Used on almost all telescope camera adapters, reducers, flatteners, and off-axis guiders. Also used on microscope phototube adapters. Not compatible with M42x1 despite the same diameter.
The most widely used camera lens thread in history. Also called Pentax screw mount, Praktica thread, or Universal mount. Used on: Zenit SLRs (USSR/Russia), Praktica cameras (East Germany), Pentax Spotmatic, Fujica, Yashica, Ricoh, and hundreds of lens manufacturers worldwide. Still in use by KMZ (Cosina/Voigtländer). Also the standard thread for most enlarger lensboards and bellows extension tubes.
Filter thread used on some cameras, including some Minolta and Konica models.
Filter thread on various cameras; also front thread on some Schneider Componon-S enlarger lenses.
Filter thread on some cameras and accessories.
Filter thread on some vintage cameras.
Filter thread on some cameras.
Filter thread on some cameras, including some Canon and Nikon compact models.
Filter thread on some vintage cameras.
Filter thread on various cameras; also found on some enlarger lenses.
Front/rear thread on some enlarger lenses; also found on some camera accessories.
Filter thread on some cameras.
Uncommon filter thread found on some cameras.
Filter thread on some vintage cameras and Soviet lenses.
Mount thread of some lenses.
Equipment and systems: Rectar 25cm lens
Hexar 25cm lens
Yamasaki Anastigmat 21cm lens
Filter thread on some lenses.
Equipment and systems: Angeniex-Zoom Type 8x8B 1.9/8-64mm lens
Filter thread on some cameras; also on some telescope focuser accessories.
Equipment and systems: Taylor Hobson Ortal 50mm f2 lens
"Wide T-thread" — increasingly popular in astronomy as a larger alternative to T2. Found on modern telescope focuser drawtubes, reducers, and astro camera accessories. Also a common 2" telescope accessory thread.
Equipment and systems: Deep Sky Dad Field Rotator 1
M48x40tpi thread is used by some JML electronic shutters.
Equipment and systems: Some JML electronic shutters.
Very common filter thread — used by many Canon, Nikon, Sony, and third-party lenses (e.g. Canon EF 50mm f/1.8 STM, many 18-55mm kit lenses, various Nikon primes). Probably the most frequently encountered filter size in everyday photography.
Filter thread on some cameras and lenses.
Filter thread on some vintage cameras and lenses, including certain Leica models.
Equipment and systems: Angenieux Type S3 1.8/75mm lens
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