Uncommon thread found on some specialty microscope objectives and photomicroscopy equipment.
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.
Some flat pinhole lenses use such a thread.
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)
Used on small Meopta enlarger lenses (e.g. Anaret 50mm/80mm from Opemus enlargers) and some Eastern European microscope accessories.
Small filter and accessory thread found on some compact optics, cine lenses, and microscopy equipment.
Thread on some microscope objectives and condensers; also used in certain industrial optical mounts.
Uncommon thread encountered on some vintage microscope objectives.
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.
Durst enlarger Lapla lensboard thread (25mm mount); also found on some older microscope eyepiece tubes.
Some GOI prototype lenses.
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.
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.
Thread on some specialty microscope and optical industry components.
Rare thread found on some niche microscopy and industrial optical mounts.
Standard thread for Zeiss infinity-corrected microscope objectives (Plan-Apochromat, Plan-Neofluar, etc.). The canonical Zeiss objective thread for modern research microscopes.
Filter thread used on some compact cameras and small optics; also found on microscopy accessories.
Uncommon pitch found on some enlarger accessories and specialty optical mounts.
Filter thread found on some compact cameras, bridge cameras, and small scope accessories.
Found on some older enlarger and repro lenses.
Thread used on some Leica and Leitz enlarger lenses and accessories.
Rare specialty thread found on some vintage enlarger or repro lenses.
Filter thread on some compact cameras; also seen on microscopy accessories.
Filter thread found on some older compact and rangefinder cameras.
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