Miniature lens mounting thread with a nominal diameter of 12 mm and a pitch of 0.5 mm. Commonly known as S-mount or board lens mount, it is widely used in compact CCTV and embedded imaging systems.
Equipment and systems: S-mount board-camera lenses and M12x0.5 lens holders.
Examples include Lensation S-mount lenses, Commonlands M12 lenses, and Basler dart cameras equipped with an S-mount lens holder.
Compatibility and limitations: Not interchangeable with M12x0.75.
Matching threads alone do not guarantee that a lens will focus correctly or cover the camera sensor. Check the lens back focal distance, sensor format, holder depth and rear-element clearance.
S-mount does not specify a single flange focal distance.
Note: Focus is commonly adjusted by screwing the lens into or out of its holder. Secure the final position with a suitable locking method and avoid allowing the rear of the lens to contact the sensor or protective glass.
Camera · CCTV
Metric thread with a nominal diameter of 12 mm and a pitch of 0.75 mm. Used as the attachment interface on threaded versions of certain ShiftCam smartphone add-on lenses.
Equipment and systems: Documented examples include threaded versions of these ShiftCam ProLens accessories:
• 60mm Telephoto
• 18mm Wide-Angle
• 1.33x Anamorphic
These accessories mount in front of a smartphone’s existing camera lens.
Compatibility and limitations: Not interchangeable with the M12x0.5 thread used by S-mount board-camera lenses.
Compatibility depends on the exact lens version and mounting accessory. Check the thread pitch, available engagement, seating clearance and alignment with the phone’s camera.
A matching thread does not guarantee compatibility with every phone, case or camera position.
Note: Do not confuse this threaded connection with ShiftCam’s S.Mount twist-lock bayonet. ShiftCam offers converter rings for attaching existing threaded LensUltra lenses to its S.Mount accessories; the two interfaces are distinct.
Smartphone
Larger board-mount lenses for industrial cameras and some CCTV applications requiring a wider barrel than M12.
CCTV · Smartphone
Thread used in some smartphone lens accessories. Appears on telephoto and wide-angle add-on lenses for mobile photography.
Equipment and systems: Beastcage phone lens case
Compatibility and limitations: It is not compatible with the M17x1 thread used on other cases and cages.
Smartphone
Thread used in some smartphone lens accessories. Appears on telephoto and wide-angle add-on lenses for mobile photography.
Equipment and systems: Examples — check the exact model and thread specification.
Neewer iPhone cage
Sandmarc phone lens case
Ulanzi phone lens case
Compatibility and limitations: Match both the 17 mm thread diameter and the 1 mm pitch. Check whether a male or female connection is required. Mechanical thread compatibility alone does not guarantee correct alignment with the phone camera.
Smartphone
This thread was used to mount lenses to some machines engineered for document copying, technical reduction, and microfilm applications.
Equipment and systems: Schneider D-Claron 4/23mm
Cinema / Projection
Some microscope objective turrets are mounted using such a thread.
Microscope
M18x1 thread is used in vintage Pentaka 8mm film movie cameras.
Equipment and systems: Pentaka 8mm film movie camera
Cinema / Projection
Found on some older and Eastern European microscope objectives; also appears on certain telescope accessories.
Microscope · Telescope
Uncommon thread found on some specialty microscope objectives and photomicroscopy equipment.
Microscope
Some small lenses mount thread. Also, a filter thread on some lenses.
Equipment and systems: Zeiss S-Planar 4/32mm lens (mount thread)
Schneider-Kreuznach Xenar/Xenon D-Mount lenses (filter thread)
Compatibility and limitations: The same lens name doesn't guarantee compatibility, since old parts weren't strictly standardized. Always measure your particular lenses directly.
Camera · Cinema / Projection
Some flat pinhole lenses use such a thread.
Camera
Filter thread for small lenses. Also, lens cells of #00 shutters use this thread.
Equipment and systems: Compur #00 lens cells
Synchro Compur #00 lens cells
Industar-69 lens (filter thread)
Minitar-1 32mm f/2.8 Art lens (filter thread)
Camera · Filters
Used on small Meopta enlarger lenses (e.g. Anaret 50mm/80mm from Opemus enlargers) and some Eastern European microscope accessories.
Microscope · Enlarger
Small filter and accessory thread found on some compact optics, cine lenses, and microscopy equipment.
Microscope · Filters
Thread on some microscope objectives and condensers; also used in certain industrial optical mounts.
Microscope
Uncommon thread encountered on some vintage microscope objectives.
Microscope
Standard thread for Nikon (CFI60 system) and Leica infinity-corrected microscope objectives. Both brands adopted this size when they moved away from the universal RMS standard.
Note: Also used in some Thorlabs optical systems.
Microscope
Durst enlarger Lapla lensboard thread (25mm mount); also found on some older microscope eyepiece tubes.
Microscope
Some GOI prototype lenses.
Camera
Nikon BD objectives use M26x0.75 metric thread.
Mitutoyo infinity-corrected plan-apochromat objectives (M Plan Apo, M Plan Apo HR series) use M26x36tpi mixed thread.
Compatibility and limitations: Our adapters in this category are designed to accept both Nikon M26x0.75 and Mitutoyo M26x36tpi microscope objectives, using a short, clearance-fit thread.
Microscope
Lens mount on some Robot cameras.
Equipment and systems: Some Robot cameras.
Compatibility and limitations: Robot cameras had many different mounts, and even 26mm thread can have different pitches. Internet sources say that older cameras have an M26x0.75 thread while newer cameras have an M26x1 thread. Please measure your mount diameter and pitch before purchasing an adapter.
Camera
Thread on some specialty microscope and optical industry components.
Microscope
Rare thread found on some niche microscopy and industrial optical mounts.
Microscope
Standard thread for Zeiss infinity-corrected microscope objectives (Plan-Apochromat, Plan-Neofluar, etc.). The canonical Zeiss objective thread for modern research microscopes.
Microscope
Filter thread used on some compact cameras and small optics; also found on microscopy accessories.
Microscope · Filters
Uncommon pitch found on some enlarger accessories and specialty optical mounts.
Microscope · Enlarger
Filter thread found on some compact cameras, bridge cameras, and small scope accessories.
Telescope · Filters
Found on some older enlarger and repro lenses.
Enlarger
Thread used on some Leica and Leitz enlarger lenses and accessories.
Enlarger
Rare specialty thread found on some vintage enlarger or repro lenses.
Enlarger
Filter thread on some compact cameras; also seen on microscopy accessories.
Microscope · Filters
Filter thread found on some older compact and rangefinder cameras.
Filters
Filter thread on some compact cameras; also found on some enlarger lens mounts.
Enlarger · Filters
Filter thread used on some cameras and optical instruments; also on some microscope eyepiece tubes.
Microscope · Telescope · Filters
Thread used on some Nikon microscope nosepieces and trinocular phototube adapters.
Microscope
Filter thread found on many older Japanese cameras (e.g. Canonet, Olympus Trip, some Minolta rangefinders). One of the more common vintage compact camera filter sizes.
Filters
Filter thread on some vintage compact cameras.
Filters
Filter thread; also found on some microscope condensers and lab optical components. Yet another application is a Kiev-16U cine camera.
Microscope · Filters · Cinema / Projection
Standard thread for some Nikon microscope objectives (older series and BD-plan series). Also used on some Nikon microscope nosepieces and trinocular adapters.
Note: Do not confuse with M32.5x0.5 (enlarger Copal #0 thread).
Microscope
Copal #0 shutter thread and rear mount thread for many enlarger lenses: Schneider Componon-S, Rodenstock Rodagon, some El-Nikkor variants. Standard for 35mm format enlarger lenses on many lensboards.
Enlarger
Filter thread on some compact cameras and binoculars.
Filters
Filter thread on some vintage cameras and binoculars.
Filters
Filter thread found on some compact cameras.
Filters
Filter thread on some cameras, notably some Konica models.
Filters
Filter thread on various cameras; also found on some Leica accessories.
Filters
Thread on some older enlarger lenses and optical accessories.
Enlarger · Filters
Filter thread on some compact cameras, notably some Olympus Stylus/μ series models.
Filters
Filter thread on some vintage cameras, including certain Leica models and some Voigtländer lenses.
Equipment and systems: Kiev-16U lenses (but be careful - another version with M33x0.5 thread exists)
LCM-20MP-35MM-F2.8-1.1-ND1
Obj LINOS MeVis C 25mm/f1,6
Filters
Filter thread on some old lenses.
Equipment and systems: Some Zeiss Stasi lenses.
Filters
Filter thread on some cameras and optics.
Filters
Filter thread; also used on some telescope accessories.
Telescope · Filters
Found on some telescope eyepieces and photo accessories; also the front filter thread of some early Leica lenses.
Telescope · Filters
Thread on some telescope accessories, notably used by Baader Planetarium for some 1.25" eyepiece adapters.
Telescope
Filter thread found on some cameras, notably early Leica M lenses and some Voigtländer Bessa models.
Filters
Beastgrip Pro phone cage.
Equipment and systems: Century Optics .65x HR Wide Angle Converter.
Smartphone
Filter thread on some cameras; found on some enlarger lens accessories.
Equipment and systems: 10mm C-mount Switar lens.
Enlarger · Filters
Filter/accessory thread; also seen on some enlarger lenses.
Enlarger · Filters
Found on some enlarger lenses and photo accessories.
Enlarger
Uncommon thread on some enlarger or specialty optical equipment.
Enlarger
Filter thread for Leica M lenses and some rangefinder camera lenses with 39mm front diameter.
Filters
Filter thread used on some Soviet camera lenses (e.g. Industar, Jupiter series) and some enlarger lenses. Not to be confused with LTM (M39x1/26tpi).
Camera · Filters
Leica Thread Mount (LTM) — the original Leica screw mount introduced in the 1930s. Also used on Soviet rangefinder cameras (FED, Zorki, Kiev, early Zenit) and most enlarger lenses globally (L39 enlarger mount). One of the most common threads in the catalogue.
Note: Note: LTM pitch is 26 tpi (≈0.977mm) not a true metric 1mm pitch, but the difference is negligible for short threads.
Camera · Enlarger
Uncommon specialty thread found on some vintage Soviet and Eastern European optical equipment.
Camera
Filter thread on some cameras.
Filters
Filter thread on some cameras; also found on some enlarger lenses (front thread of some Schneider Componon-S models).
Camera · Filters
Found on some vintage cameras and optical accessories.
Equipment and systems: Large Mitutoyo microscope objectives.
Microscope · Camera
Filter thread on some cameras; front thread of some Schneider enlarger lenses.
Filters
Front thread of many popular enlarger lenses: Schneider Componon-S 100mm, some El-Nikkor versions. Also filter thread on some compact cameras (Olympus).
Enlarger · Filters
Found on some vintage cameras and accessories.
Camera
Thread used on some telescope focuser draw tubes and astro accessories.
Telescope
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.
Telescope · Camera
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.
Camera · Enlarger
Filter thread used on some cameras, including some Minolta and Konica models.
Filters
Filter thread on various cameras; also front thread on some Schneider Componon-S enlarger lenses.
Enlarger · Filters
Filter thread on some cameras and accessories.
Filters
Filter thread on some vintage cameras.
Filters
Filter thread on some cameras.
Filters
Filter thread on some cameras, including some Canon and Nikon compact models.
Filters
Filter thread on some vintage cameras.
Filters
Filter thread on various cameras; also found on some enlarger lenses.
Filters
Front/rear thread on some enlarger lenses; also found on some camera accessories.
Enlarger · Filters
Filter thread on some cameras.
Filters
Uncommon filter thread found on some cameras.
Filters
Filter thread on some vintage cameras and Soviet lenses.
Filters
Mount thread of some lenses.
Equipment and systems: Rectar 25cm lens
Hexar 25cm lens
Yamasaki Anastigmat 21cm lens
Camera
Filter thread on some lenses.
Equipment and systems: Angeniex-Zoom Type 8x8B 1.9/8-64mm lens
Filters
Filter thread on some cameras; also on some telescope focuser accessories.
Equipment and systems: Taylor Hobson Ortal 50mm f2 lens
Telescope · Camera
"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
Telescope · Filters
M48x40tpi thread is used by some JML electronic shutters.
Equipment and systems: Some JML electronic shutters.
Camera
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.
Filters
Filter thread on some cameras and lenses.
Filters
Filter thread on some vintage cameras and lenses, including certain Leica models.
Equipment and systems: Angenieux Type S3 1.8/75mm lens
Filters
Equipment and systems: KamLan 50mm f1.1, the old version.
Filters
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.
Enlarger · Filters
Equipment and systems: Angenieux Type M2 1.1/28mm.
Filters
Filter thread on some cameras and lenses.
Filters
Filter thread on some cameras and lenses, including certain Sigma and Tamron models.
Filters
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.
Filters
Found on some telescope accessories; also used on helicoid focusing adapters for macro photography.
Telescope · Filters
Filter thread on some lenses and accessories.
Filters
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
Telescope · Filters
Filter/accessory thread; also found on some telescope focusers.
Telescope · Filters
Filter thread on some cameras and lenses.
Filters
Filter thread on many cameras and lenses; common on various Canon, Nikon, and Pentax models.
Filters
Filter thread on some cameras.
Filters
Filter thread on some cameras and lenses.
Filters
Filter thread on some cameras; front thread on some Schneider Componon-S 100mm (older variant) and Rodenstock Rodagon enlarger lenses.
Enlarger · Filters
Found on some larger enlarger lenses (Schneider) and some telescope accessories.
Enlarger · Filters
Camera
Filter thread on some cameras and lenses.
Filters
Filter thread on some cameras.
Filters
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.
Telescope · Filters
Found on some telescope drawtubes and larger astro accessories.
Telescope · Filters
Filter thread on some cameras and lenses.
Filters
Filter thread on some cameras and lenses; also found on some telescope accessories and larger-aperture focuser tubes.
Telescope · Filters
Filter thread on some cameras and lenses; found on some telescope accessories.
Telescope · Filters
Filter/accessory thread; found on some telescope focusers and larger cameras.
Telescope · Filters
Found on some telescope focuser drawtubes and accessories.
Telescope · Filters
Very common filter thread on larger lenses. Found on many zoom and telephoto lenses from Nikon, Pentax, and Tamron (e.g. 70-210mm zooms). Standard thread for many 62mm filters.
Telescope · Filters
Found on some telescope accessories and some Hasselblad accessories (B62 filter mount).
Telescope · Filters
Thread found on some telescope focusers, notably certain older Vixen and Takahashi refractors.
Telescope
Found on some telescope accessories and larger optical systems.
Equipment and systems: QSI 700-series OAG (off-axis guider)
Riccardi M63 0.75x Reducer
TS-Optics 71SDQ
WO Flat6AIII 0.8x Reducer
Telescope
Filter/accessory thread on some cameras and telescopes.
Telescope
Filter thread on some cameras and lenses; found on some Minolta medium-format lenses.
Filters
Found on some telescope focuser drawtubes (older Celestron and Meade accessories).
Telescope · Filters
Thread used on some telescope focusers, particularly some Sky-Watcher and Orion refractors.
Telescope
Found on some larger telescope focuser assemblies.
Telescope
Imperial-pitch thread found on some older telescope focusers.
Telescope
Filter thread on some larger lenses; also found on some telescope accessories.
Telescope · Filters
Filter thread on some cameras and lenses.
Filters
Common filter thread on larger telephoto and zoom lenses. Found on many Sigma, Tamron, and Canon zoom lenses. Standard for 67mm filters.
Filters
Found on some telescope accessories and some camera equipment.
Telescope · Filters
Filter thread on some cameras and lenses.
Filters
Filter thread on some cameras and lenses; found on some telescope accessories.
Telescope · Filters
Found on some telescope focusers and accessories.
Telescope · Filters
Used in some telescopes like Borg refractors.
Equipment and systems: Borg 101ED telescope.
Telescope
This is a Flektoskop-Screwmount thread.
Camera
Filter/accessory thread on some larger lenses and telescope accessories.
Telescope · Filters
Found on some telescope accessories and camera equipment.
Telescope
Common filter thread on larger telephoto lenses. Found on many Nikon and Canon telephoto primes and zooms, some medium-format lenses. Standard for 72mm filters.
Filters
Found on some telescope focuser drawtubes and accessories (notably used on some Takahashi refractors).
Telescope · Filters
Filter/accessory thread found on some cameras and telescope equipment.
Telescope · Filters
Equipment and systems: Heliostar 100 telescope.
Telescope
Filter/accessory thread; found on some telescope accessories and larger cameras.
Filters
Equipment and systems: Fuji Rectar 25cm f4.5 lens in the oldest Tessar design of Fuji, barrel
Yamasaki Congo 250mm f4.5 lens
Camera
Filter/accessory thread; found on some telescope accessories.
Telescope · Filters
Very common filter thread on professional telephoto and zoom lenses. Found on many Canon L-series lenses, Nikon AF-S telephotos, Sigma Art lenses, and numerous others. One of the most widely-used large filter sizes.
Filters
Filter thread on some lenses; found on some Hasselblad medium-format accessories.
Filters
Filter/accessory thread on large lenses and telescope equipment.
Telescope · Filters
Found on some telescope focuser drawtubes and larger optical components.
Telescope · Filters
Common filter thread on large telephoto lenses. Found on Canon 16-35mm f/2.8L, some Sigma and Tokina wide-angle lenses. Standard for 82mm filters.
Filters
Found on some telescope accessories and large optics.
Telescope · Filters
Filter/accessory thread on some lenses and telescope equipment.
Telescope · Filters
Filter thread on some larger professional lenses.
Filters
Found on some larger telescope accessories and professional camera equipment.
Telescope · Filters
Filter thread on some professional telephoto lenses; also on some telescope accessories.
Telescope · Filters
Found on some telescope focuser assemblies and large optical equipment.
Telescope · Filters
Filter/accessory thread on some large lenses and telescope equipment.
Equipment and systems: Askar SQA106 telescope tube.
Telescope · Filters
Filter thread on some large professional lenses.
Filters
Found on some large telescope accessories and professional lenses.
Telescope · Filters
Found on some large telescope drawtube assemblies and professional optical equipment.
Telescope · Filters
Found on some telescope focuser drawtubes, notably some William Optics refractors.
Telescope
Thread found on some large telescope accessories.
Telescope
Thread found on some large telescope accessories.
Telescope
Found on some large telescope accessories and professional optical instruments.
Telescope · Filters
Found on some large telescope drawtube assemblies; used by some Celestron SCT accessories.
Telescope
Found on some large telescope accessories and professional optical systems.
Telescope
Found on some large telescope accessories.
Telescope
Very large thread used on large-aperture telescope focusers and accessories.
Telescope
Found on some large telescope drawtube assemblies and accessories.
Telescope
Large telescope focuser thread; also filter thread on some super-telephoto lenses (Canon, Nikon 500mm+ primes).
Telescope
Filter thread on some lenses.
Equipment and systems: Sigma 60-600mm f4.5-6.7 DG DN lens (Sony version).
Filters
Found on some very large telescope accessories.
Telescope
Found on some large telescope accessories.
Telescope
Found on some very large telescope accessories and professional astronomical equipment.
Telescope
Equipment and systems: Sirui Jupiter 28-85mm lens filter thread.
Filters
Very large thread on large-aperture telescope accessories.
Equipment and systems: Apo-Nikkor 11/760mm process lens.
Telescope · Camera
Found on some very large telescope drawtube assemblies.
Telescope
Found on some large telescope accessories.
Telescope
Equipment and systems: Omegon ED 100/600 APO Doublet.
Telescope
Found on some large telescope accessories.
Telescope
Found on some very large telescope accessories and professional astronomical equipment.
Telescope
Found on some very large telescope accessories.
Telescope
Very large telescope thread; used on some Schmidt-Cassegrain accessories and large refractors.
Telescope
Very large thread found on some large-aperture telescope accessories.
Telescope
Very large telescope thread found on some large-aperture refractor focusers and observatory equipment.
Telescope
Standard mount for industrial cameras, machine vision cameras, CCTV, and cine cameras since the 1930s. Also used on many microscope camera adapters (trinocular phototubes) and some scientific cameras. Thread: 1 inch (25.4mm) x 32 TPI, flange distance 17.526mm.
Microscope · Telescope · CCTV
Same thread as C-mount (1"x32tpi) but with a shorter 12.526mm flange focal distance. Used on security cameras, CCTV, and some industrial cameras. CS-mount cameras can accept C-mount lenses via a 5mm spacer.
Microscope · CCTV
Standard for 8mm and 16mm cine cameras and some early video cameras. Thread: 15.88mm x 32 TPI, flange distance 12.29mm. Used in Kodak 8mm cameras, Bolex 8mm, and some early TV lenses. Now used with adapter rings on mirrorless cameras.
CCTV · Cinema / Projection
Thread found on some older telescope accessories with imperial pitch.
Telescope
Thread found on some telescope accessories with imperial pitch, notably some older Zeiss and Baader accessories.
Telescope
Royal Microscopical Society standard — the universal microscope objective thread since the 19th century. Thread: 20.32mm x 36 TPI. Used by Olympus and Zeiss on their finite-conjugate objectives; also on many older Nikon objectives and virtually all "DIN" standard objectives from Leitz, American Optical, and others.
Microscope · Enlarger
Standard for Schmidt-Cassegrain telescope (SCT) back-cell threads. Used on Celestron and Meade SCTs to attach visual backs, reducers, and camera adapters. Thread: 2 inch x 24 TPI.
Telescope
Thorlabs SM1 thread — a common standard for laboratory and photonics optomechanics. Used extensively in Thorlabs cage systems, tube lens assemblies, and microscopy research setups. Thread: 1.035 inch x 40 TPI.
Microscope · Telescope
Thorlabs intermediate thread standard for larger optical tube assemblies.
Microscope · Telescope
Thorlabs SM2 thread for larger cage system components and larger-format optical systems. Thread: 2.035 inch x 40 TPI.
Microscope · Telescope
Thorlabs SM3 thread for the largest cage system components. Thread: 3.035 inch x 40 TPI.
Microscope · Telescope
Equipment and systems: PrimaLuceLab ESATTO 2" robotic focuser.
Telescope
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