A T2 thread, also written T-2, has a diameter of 42mm and a thread pitch of 0.75mm. It is also sometimes written as M42x0.75.
The low pitch distinguishes it from other M42 threads.
Omegon
T-thread Extension and 2'' nosepiece 21mm
$ 19.90
ready for shipping in 24
h
Omegon
Extension tube Extender 30 mm T- thread
$ 29.90
ready for shipping in 24
h
Omegon
15mm T2i/T2a T2 extension ring
$ 24.90
ready for shipping in 24
h
Omegon
40mm T2i/T2a T2 extension ring
$ 24.90
ready for shipping in 24
h
Omegon
Extension tube Extender 17 mm T-thread
$ 29.90
ready for shipping in 24
h
Omegon
7.5 mm T2i/T2a T2 extension ring
$ 19.90
ready for shipping in 24
h
Omegon
Extension tube Extender 7 mm T-thread
$ 29.90
ready for shipping in 24
h