The T mount is a 42mm screw thread with a 0.75mm pitch, also called T2. It is not interchangeable with M42, which shares the 42mm diameter but uses a 1mm pitch. A T-mount lens takes a camera-specific T-ring adapter, so the same lens can be used on nearly any SLR or mirrorless body.

This T Mount lens is rated for infrared photography from a real-world test by an IR photographer. Its rating is Good for hot spots, the bright spot some lenses leave in the center of an infrared image, following the thresholds below.

IR Focal
Length		 Minimum
Aperture		 Lens Filter Weight Notes Images
Good 35mm ƒ/3.5 Kyoei / Kuribayashi Clone 35mm F/3.5-22
 ⌀34mm(?) 149 g No hotspots or ghosting at any apertures. The left and right 3rd of the frame is very soft and smeared, though this isn’t specific to IR and could be my copy, this is a very old lens. Michael Piantedosi  

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What the ratings mean. Hot spots usually appear as you increase the lens ƒ-number, so each rating depends on the lowest ƒ-stop where a hot spot shows and how severe it is, and the thresholds differ by sensor format.

  • Good: No hot spots, or one that starts at ƒ/11 or higher where diffraction impacts image sharpness.
  • Maybe: Contains a mild hot spot that starts at ƒ/5.6 or ƒ/8 and is correctable in editing.
  • Bad: A hot spot that starts at ƒ/4 or lower, or is hard to correct in editing.
  • Unknown: No data reported.

How reports are checked and rated

T Mount Lens Mount Adapters

Use an adapter to mount these lenses to many mirrorless cameras.

B&H - T Mount lens mount adapters

Adorama - T Mount lens mount adapters