T-Mount: An interchangeable lens mounting system for slide duplicators, microscope adapters and telescope attachments, lenses without automatic diaphragms and other optical accessories.
M42/T-mount confusion.
The M42 threaded mount (the "universal screw mount" popularized by the Pentax Spotmatic camera) is similar to the Tamron T-mount - both mounts are 42mm in diameter. However, M42 lenses use 1mm threads and T-mounts use 0.
Compared to wet-mount fisheye lenses
The Pany 8mm fisheye is wider and sharper than wet-mount fisheye lenses for compact cameras like the Dyron 16mm fisheye, or the FIX UWL-04.
Other micro-four thirds fisheye lenses ...
I'd probably try a used Celestron 8 in the classic 1970s fork mount (8" Schmidt-Cassegrain telescope, a 2,000 mm f/10 mirror lens) and the Celestron camera adapter with a T-mount for Nikon or Canon as needed.
Canon, which produced the FD lens mount (known as the breech-mount; a unique lens mounting system that combines the advantages of screw-mount and bayonet-mount) introduced their shutter priority 35 mm SLR, the Canon EF in 1976 or so.
Summary: This is a description of the technique my studio used to wet-mount large black-and-white murals around 1960. While some of the materials have changed, I believe the basic technique remains valid.
Work the release an twist the lens to remove, with bayonet-mount lenses. To replace the lens, line up the slots, or two dots (one on the lens and one on the body) and twist until the lens clicks into place. DO NOT FORCE THE LENS! ...
AMAZON have a couple of lower cost mirror lenses available through their website, including The Samyang/Phoenix 500/8 for about $110 in a T-mount (about $127 with an adapter for Canon EOS) ...
(With a 1.4X teleconverter you lose just one stop, but magnification is increased only 40 percent.) Pro Optic teleconverters are available for Nikon, Canon, Pentax, Sony, or T-mount lenses.
 See also: Time, Lens, Lenses, Speed, Camera
  
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