Equipment and systems: KamLan 50mm f1.1, the old version.
Rear mount thread for some medium-format enlarger lenses: El-Nikkor 135mm A, 150mm A (in the convertible version), some Rodagon lenses. Also front thread of some longer enlarger lenses.
Equipment and systems: Angenieux Type M2 1.1/28mm.
Filter thread on some cameras and lenses.
Filter thread on some cameras and lenses, including certain Sigma and Tamron models.
Very common filter thread — found on many Nikon, Pentax, and Soviet lenses. Nikon uses 52mm filters on many classic primes (50mm f/1.4, 50mm f/1.8, 28mm f/2.8 etc). Also the rear thread on El-Nikkor 50mm and 80mm enlarger lenses.
Found on some telescope accessories; also used on helicoid focusing adapters for macro photography.
Filter thread on some lenses and accessories.
Filter thread on some lenses; used by some Pentax medium-format lenses.
Also, this is a widely used thread in astronomy.
Equipment and systems: ZWO Camera Angle Adjuster
Explore Scientific AR152 drawtube
Filter/accessory thread; also found on some telescope focusers.
Filter thread on some cameras and lenses.
Filter thread on many cameras and lenses; common on various Canon, Nikon, and Pentax models.
Filter thread on some cameras.
Filter thread on some cameras and lenses.
Filter thread on some cameras; front thread on some Schneider Componon-S 100mm (older variant) and Rodenstock Rodagon enlarger lenses.
Found on some larger enlarger lenses (Schneider) and some telescope accessories.
Filter thread on some cameras and lenses.
Filter thread on some cameras.
Common filter thread on many lenses. Also used as the telescope focuser thread on many astro accessories (equivalent function to T2 but for larger-aperture drawtubes). Found on Nikon 50mm f/1.4 AI, various Nikkor lenses, and some Soviet lenses.
Found on some telescope drawtubes and larger astro accessories.
Filter thread on some cameras and lenses.
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