Thread Adapters

In photography a standardized adaption device for the changing of lenses which works independent from the manufacturer is called screw thread or lens thread. Screw threads are the forerunners of the bayonet connectors, which dominate the market nowadays.

In this section you will find step-up rings, step-down rings, pitch converters, all other kinds of adapters with threads.

 

RafCamera — Complete Threads Reference

Thread Adapters
Sorted by diameter, ascending

Every threaded mount in the RafCamera catalogue, with usage context — microscopes, cameras, telescopes, enlargers, and more. Sorted from smallest to largest diameter.

130+
thread sizes
8
application areas
Categories: MICROSCOPE TELESCOPE / ASTRO PHOTO / CAMERA ENLARGER CCTV / MACHINE VISION SMARTPHONE FILTER PROJECTION / CINEMA
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M12–M19 Small board / smartphone lenses
S-mount (board lens mount). Standard for CCTV cameras, IP cameras, drone cameras, Raspberry Pi cameras, machine vision boards, and action cameras.
CCTVSMARTPHONE
S-mount (board lens mount). Standard for CCTV cameras, IP cameras, drone cameras, Raspberry Pi cameras, machine vision boards, and action cameras. Particularly, Shiftcam lenses.
CCTVSMARTPHONE
Larger board-mount lenses for industrial cameras and some CCTV applications requiring a wider barrel than M12.
CCTV
Thread used in some smartphone lens accessories (e.g. Apexel, FotoZ, Sandmarc clip-on lenses for iPhones). Appears on telephoto and wide-angle add-on lenses for mobile photography.
SMARTPHONE
Found in some industrial and specialty board cameras; also used as a filter thread on small optics.
CCTV
Found on some older and Eastern European microscope objectives; also appears on certain telescope accessories.
MICROSCOPE
M21–M29 Microscope objectives, small optics
Uncommon thread found on some specialty microscope objectives and photomicroscopy equipment.
MICROSCOPE
Occasionally used on small microscope condensers and photographic accessories.
MICROSCOPE
Used on small Meopta enlarger lenses (e.g. Anaret 50mm/80mm from Opemus enlargers) and some Eastern European microscope accessories.
ENLARGERMICROSCOPE
Small filter and accessory thread found on some compact optics, cine lenses, and microscopy equipment.
FILTERMICROSCOPE
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.
Also used in some Thorlabs optical systems.
MICROSCOPE
Durst enlarger Lapla lensboard thread (25mm mount); also found on some older microscope eyepiece tubes.
ENLARGERMICROSCOPE
Standard for Mitutoyo infinity-corrected plan-apochromat objectives (M Plan Apo, M Plan Apo HR series). Also called W26; conforms to ISO 9345 / JIS B 7141. Sometimes labelled M26 by sellers.
MICROSCOPE
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.
FILTER
Uncommon pitch found on some enlarger accessories and specialty optical mounts.
ENLARGER
Filter thread found on some compact cameras, bridge cameras, and small scope accessories.
FILTER
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.
FILTER
Filter thread found on some older compact and rangefinder cameras.
FILTER
M30–M39 Enlarger lenses, M39 LTM, RMS microscopes
Filter thread on some compact cameras; also found on some enlarger lens mounts.
FILTER
Filter thread used on some cameras and optical instruments; also on some microscope eyepiece tubes.
FILTERMICROSCOPE
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.
FILTER
Filter thread on some compact cameras; found on some enlarger accessories.
FILTER
Filter thread on some vintage compact cameras.
FILTER
Filter thread; also found on some microscope condensers and lab optical components. Yet another application is a Kiev-16U cine camera.
FILTERMICROSCOPECINE
Standard thread for some Nikon microscope objectives (older series and BD-plan series). Also used on some Nikon microscope nosepieces and trinocular adapters.
Do not confuse with M32.5×0.5 (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.
FILTER
Filter thread on some vintage cameras and binoculars.
FILTER
Filter thread found on some compact cameras.
FILTER
Filter thread on some cameras, notably some Konica models.
FILTER
Filter thread on various cameras; also found on some Leica accessories.
FILTER
Thread on some older enlarger lenses and optical accessories.
FILTER
Filter thread on some compact cameras, notably some Olympus Stylus/μ series models.
FILTER
Filter thread found on some vintage cameras and specialty optics.
FILTER
Filter thread on some vintage cameras, including certain Leica models and some Voigtländer lenses.
FILTER
Filter thread on some cameras and optics.
FILTER
Filter thread; also used on some telescope accessories.
FILTER
Found on some telescope eyepieces and photo accessories; also the front filter thread of some early Leica lenses.
TELESCOPEFILTER
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.
FILTER
Beastgrip Pro phone cage.
SMARTPHONE
Filter thread on some cameras; found on some enlarger lens accessories.
FILTER
Filter/accessory thread; also seen on some enlarger lenses.
FILTER
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.
FILTER
Filter thread used on some Soviet camera lenses (e.g. Industar, Jupiter series) and some enlarger lenses. Not to be confused with LTM (M39×1/26tpi).
FILTERCAMERA
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: LTM pitch is 26 tpi (≈0.977mm) not a true metric 1mm pitch, but the difference is negligible for short threads.
CAMERAENLARGER
Uncommon specialty thread found on some vintage Soviet and Eastern European optical equipment.
CAMERA
Filter thread on some cameras.
FILTER
M40–M49 M42 universal mount, T2, enlarger lenses
Filter thread on some cameras; also found on some enlarger lenses (front thread of some Schneider Componon-S models).
FILTER
Found on some vintage cameras and optical accessories.
CAMERA
Filter thread on some cameras; front thread of some Schneider enlarger lenses.
FILTER
Front thread of many popular enlarger lenses: Schneider Componon-S 100mm, some El-Nikkor versions. Also filter thread on some compact cameras (Olympus).
ENLARGERFILTER
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 M42×1 despite the same diameter.
TELESCOPEMICROSCOPE
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.
CAMERAENLARGER
Filter thread used on some cameras, including some Minolta and Konica models.
FILTER
Filter thread on various cameras; also front thread on some Schneider Componon-S enlarger lenses.
FILTERENLARGER
Filter thread on some cameras and accessories.
FILTER
Filter thread on some vintage cameras.
FILTER
Filter thread on some cameras.
FILTER
Filter thread on some cameras, including some Canon and Nikon compact models.
FILTER
Filter thread on some vintage cameras.
FILTER
Filter thread on various cameras; also found on some enlarger lenses.
FILTER
Front/rear thread on some enlarger lenses; also found on some camera accessories.
ENLARGER
Filter thread on some cameras.
FILTER
Uncommon filter thread found on some cameras.
FILTER
Filter thread on some vintage cameras and Soviet lenses.
FILTER
Filter thread on some cameras and accessories.
FILTER
Filter thread on some cameras; also on some telescope focuser accessories.
FILTER
"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.
TELESCOPEFILTER
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
Filter thread on some cameras and lenses.
FILTER
Filter thread on some vintage cameras and lenses, including certain Leica models.
FILTER
M50–M59 Common filter threads, enlarger lenses, telescope
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.
ENLARGERFILTER
Filter thread on some cameras and lenses.
FILTER
Filter thread on some cameras and lenses, including certain Sigma and Tamron models.
FILTER
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.
FILTERENLARGER
Found on some telescope accessories; also used on helicoid focusing adapters for macro photography.
FILTERTELESCOPE
Filter thread on some lenses and accessories.
FILTER
Filter thread on some lenses; used by some Pentax medium-format lenses.
FILTER
Filter/accessory thread; also found on some telescope focusers.
FILTER
Filter thread on some cameras and lenses.
FILTER
Filter thread on many cameras and lenses; common on various Canon, Nikon, and Pentax models.
FILTER
Filter thread on some cameras.
FILTER
Filter thread on some cameras and lenses.
FILTER
Filter thread on some cameras; front thread on some Schneider Componon-S 100mm (older variant) and Rodenstock Rodagon enlarger lenses.
FILTERENLARGER
Found on some larger enlarger lenses (Schneider) and some telescope accessories.
ENLARGER
Filter thread on some cameras and lenses.
FILTER
Filter thread on some cameras and lenses.
FILTER
Filter thread on some cameras.
FILTER
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.
FILTERTELESCOPE
Found on some telescope drawtubes and larger astro accessories.
TELESCOPE
Filter thread on some cameras and lenses.
FILTER
M60–M69 Common filter and telescope threads
Filter thread on some cameras and lenses; also found on some telescope accessories and larger-aperture focuser tubes.
FILTERTELESCOPE
Filter thread on some cameras and lenses; found on some telescope accessories.
FILTER
Filter/accessory thread; found on some telescope focusers and larger cameras.
FILTER
Found on some telescope focuser drawtubes and accessories.
TELESCOPE
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.
FILTER
Found on some telescope accessories and some Hasselblad accessories (B62 filter mount).
TELESCOPEFILTER
Thread found on some telescope focusers, notably certain older Vixen and Takahashi refractors.
TELESCOPE
Found on some telescope accessories and larger optical systems.
TELESCOPE
Filter/accessory thread on some cameras and telescopes.
FILTER
Filter thread on some cameras and lenses; found on some Minolta medium-format lenses.
FILTER
Found on some telescope focuser drawtubes (older Celestron and Meade accessories).
TELESCOPE
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.
FILTER
Filter thread on some cameras and lenses.
FILTER
Common filter thread on larger telephoto and zoom lenses. Found on many Sigma, Tamron, and Canon zoom lenses. Standard for 67mm filters.
FILTER
Found on some telescope accessories and some camera equipment.
TELESCOPE
Filter thread on some cameras and lenses.
FILTER
Filter thread on some cameras and lenses; found on some telescope accessories.
FILTER
Found on some telescope focusers and accessories.
TELESCOPE
Filter/accessory thread on some cameras and telescope equipment.
FILTER
M70–M78 Large filter threads, telescope accessories
Filter/accessory thread on some larger lenses and telescope accessories.
FILTER
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.
FILTER
Found on some telescope focuser drawtubes and accessories (notably used on some Takahashi refractors).
TELESCOPE
Filter/accessory thread found on some cameras and telescope equipment.
FILTER
Filter thread on some cameras and lenses.
FILTER
Filter/accessory thread; found on some telescope accessories and larger cameras.
FILTERTELESCOPE
Filter/accessory thread; found on some telescope accessories.
TELESCOPE
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.
FILTER
Filter thread on some lenses; found on some Hasselblad medium-format accessories.
FILTER
M80–M89 Large professional lenses, telescope
Filter/accessory thread on large lenses and telescope equipment.
FILTER
Found on some telescope focuser drawtubes and larger optical components.
TELESCOPE
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.
FILTER
Found on some telescope accessories and large optics.
TELESCOPE
Filter/accessory thread on some lenses and telescope equipment.
FILTER
Filter thread on some larger professional lenses.
FILTER
Found on some larger telescope accessories and professional camera equipment.
TELESCOPE
Filter thread on some professional telephoto lenses; also on some telescope accessories.
FILTER
Found on some telescope focuser assemblies and large optical equipment.
TELESCOPE
Filter/accessory thread on some large lenses and telescope equipment.
FILTER
Filter thread on some large professional lenses.
FILTER
Found on some large telescope accessories and professional lenses.
TELESCOPE
M90–M97 Very large telescope & professional optics
Found on some large telescope drawtube assemblies and professional optical equipment.
TELESCOPE
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
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
M100–M130 Very large telescope optics
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).
TELESCOPEFILTER
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
Very large thread on large-aperture telescope accessories.
TELESCOPE
Found on some very large telescope drawtube assemblies.
TELESCOPE
Found on some large telescope accessories.
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
Imperial & specialty threads C-mount, D-mount, RMS, SCT, SM1/SM2
Same thread as C-mount (1"×32tpi) 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.
CCTV
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) × 32 TPI, flange distance 17.526mm.
CCTVMICROSCOPE
Standard for 8mm and 16mm cine cameras and some early video cameras. Thread: 15.88mm × 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.
CINE
Royal Microscopical Society standard — the universal microscope objective thread since the 19th century. Thread: 20.32mm × 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
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 × 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 × 40 TPI.
MICROSCOPETELESCOPE
Thorlabs intermediate thread standard for larger optical tube assemblies.
MICROSCOPE
Thorlabs SM2 thread for larger cage system components and larger-format optical systems. Thread: 2.035 inch × 40 TPI.
MICROSCOPETELESCOPE
Thorlabs SM3 thread for the largest cage system components. Thread: 3.035 inch × 40 TPI.
MICROSCOPE
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
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Camera thread adapters. Basics.

This device connects parts with different threads, which is very useful in photography. It allows you to switch between lenses independently of the manufacturer. The industry has caught on with the trend of cross-usage of the optics, and now manufacturers include the list of matching lenses for their cameras in the specifications. Blackmagic Pocket Cinema Camera (BMPCC) is an excellent example of it, they even provide their adapters. It seems like a good bargain. However, for those who are keen on this art and have a significant amount of optics to experiment with, a standard set of lenses may not be enough.

Filter thread adapters.

In case when the diameters of the filter and the lens do not match, a thread adapter may do the trick. We have a wide range of options in stock to help you connect the pieces of the puzzle.
Filter thread adapters come in three types:

  • Step-up adapters: These allow you to attach a filter with a larger diameter to your lens. For instance, a 52-67mm step-up ring will allow you to connect a 67mm filter to your 52mm lens filter thread.
  • Step-down adapters: they do the opposite. A 67-52mm step-down ring will allow you to attach a 52mm filter to your 67mm lens filter thread.
  • Thread pitch converters: some threads have the same diameter, but different pitches (for example, 0.5 mm or 0.75 mm), and this difference makes them incompatible. Pitch converters solve this problem.

Things to consider when using filter thread adapters

  • Beware of vignetting effect, particularly when using wide-angle lenses with step-down rings.
  • Not all devices on the market are of the same quality. Cheaper options may cause damage to your lens or filter, or stuck on them permanently.

All in all, filter thread adapters are a great accessories for any photographer looking to expand their creative possibilities without breaking the bank. By investing in high-quality filter thread adapters, photographers can use their existing filters on multiple lenses, and experiment with various filter combinations.

Enlarger Lens Adapter: essentials.

If you are an avid photography enthusiast who enjoys capturing intricate macro shots, then you are likely familiar with enlarger lens adapters. Typically utilized in conjunction with "bellows" - the adjustable extension tubes for macro lenses - these adapters have also been debated by experts as being suitable for infinity focus applications.
At our site, we offer a splendid array of options for universal M42x1 and M39x1 (also known as LTM) threads commonly used for enlarger lenses.

Other types of thread adapters

Numerous devices have thread mounts as well. For example, microscopes have a thread size range from 19 mm to 65 mm. If you want to try a non-native objective on your microscope, to capture all the details of a certain cell in the smear, we have adapters for most of the possible thread combinations to do this.

Using a microscope objective in front of a taking camera lens opens another possibility to step into the macrophotography world with low expenses. All you need is an objective in question, and a thread adapter to put this construction together.

Yet another interesting macrophotography approach is reverse mounting of taking lenses. It is when you attach a lens to the camera body in a way that is opposite to its normal orientation. For this, you need a reverse lens filter adapter. Typically, this task can be effortlessly accomplished with lenses ranging from 28 mm to 50 mm. For example, reversing a 28 mm lens can give you up to 3 times magnification. This is a budget-friendly option for those eager to try macrophotography. We have thread adapters for all these applications.

Discover the optimal lens thread adapter. MFT options

A thread adapter can also connect a lens with a screw thread mount to a camera with bayonet mount. If your goal is to try old cine lenses, you may consider using Kiev-16U lenses on the aforementioned BMPCC camera with MFT mount. Created for professional film-makers in mid 1950-s, these retro lenses help to create a 16 mm movie effect for all cameras with short flange focal distance and small sensor size. They can be used for both still photography and film-making and have been highly sought after since 2013 when we introduced the Kiev-16U to MFT adapter. Like many vintage items produced in the Soviet Union, these lenses have some peculiarities that may cause issues with standard BMPCC adapters. We offer an improved version of a light alloy device that is not only easy to install and remove, but also prevents the accident turn of the lens - not a rare occurrence for vintage lenses with stiff control rings.

Conclusion

Though we have a wide choice of adapters already, there are still some lens/camera combinations that are not covered yet. If you need a special adapter for a rare lens, please don’t hesitate to contact us, and we will consider making it from scratch.

Get your thread adapter today, and take your photography skills to new heights!