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.

ZWO
Camera ASI 2600 MC Pro Color
RRP:
$ 3,020.00
Our price:
$ 2,687.00
ready for shipping in 24
h

Omegon
Camera adaptor T2-Ring für Nikon
$ 19.90
ready for shipping in 24
h

noctutec
Electronic collimator OCAL V3.0 MAX
( 3 / 5 )
$ 367.00
ready for shipping in 3-5
weeks

noctutec
Electronic collimator OCAL V2.0 PRO
$ 216.00
ready for shipping in 3-5
weeks

ZWO
Helical Focuser 1.25"
( 5 / 5 )
$ 108.00
ready for shipping in 24
h

Omegon
40mm T2i/T2a T2 extension ring
$ 24.90
ready for shipping in 24
h

TS Optics
short T2 Helical Focuser & Adapter
RRP:
$ 108.00
Our price:
$ 75.00
ready for shipping in 3-7
days

ZWO
Camera ASI 174 MM Mono
RRP:
$ 880.00
Our price:
$ 779.00
ready for shipping in 24
h

ZWO
Camera ASI 2600 MM Pro Mono
RRP:
$ 3,890.00
Our price:
$ 3,457.00
ready for shipping in 24
h

Omegon
Adaptors 1.25'', 30mm extension tube
$ 24.90
ready for shipping in 24
h

Omegon
T2 extension tube - 30mm
$ 19.90
ready for shipping in 24
h

ZWO
T2 / C mount adapter
$ 26.90
ready for shipping in 24
h

Baader
T2/1.25" ultrashort adapter
$ 34.90
ready for shipping in 1-2
weeks

Omegon
7.5 mm T2i/T2a T2 extension ring
$ 19.90
ready for shipping in 24
h

ASToptics
M42 (FEMALE) TO M42 (FEMALE) adapter, 10MM
$ 26.90
ready for shipping in 24
h

ZWO
Camera ASI 462 MM Mono
RRP:
$ 417.00
Our price:
$ 371.00
ready for shipping in 24
h

Omegon
15mm T2i/T2a T2 extension ring
$ 24.90
ready for shipping in 24
h

Omegon
Extension tube Extender 30 mm T- thread
$ 29.90
ready for shipping in 24
h

Omegon
T2 ring for Minolta AF and Sony A-Mount cameras
$ 29.90
ready for shipping in 24
h

ASToptics
T2 extension tube - 6mm long
$ 26.90
ready for shipping in 24
h

Baader
Adapter Eyepiece clamp ClickLock 1 ¼"/T-2i
$ 95.00
ready for shipping in 1-2
weeks

QHY
Camera 183C Color
$ 930.00
Product can be shipped as of 15.04.2025

ASToptics
T2 extension tube - 9mm in length
$ 26.90
ready for shipping in 24
h

ASToptics
Extension tube T2 Fine tuning Kit - 0.5mm; 0.8mm; 1mm
$ 26.90
ready for shipping in 24
h

Baader
Extension tube Fine Tuning Ring Set T2 0.3 / 0.5 / 1mm
$ 22.90
ready for shipping in 1-2
weeks

ASToptics
Easy-Grip Twist-Lock adapter (M42 to 1.25")
( 5 / 5 )
$ 75.00
ready for shipping in 24
h

ASToptics
M42 MALE TO 1.25"/ T2 ADAPTER
$ 64.00
ready for shipping in 24
h

ASToptics
T-Thread extension kit / 7mm
$ 55.00
ready for shipping in 24
h

Starlight Xpress
Camera Trius PRO-674 Mono
$ 2,390.00
ready for shipping in 1-2
weeks

Starlight Xpress
Camera Trius PRO-674C Color
$ 2,390.00
ready for shipping in 1-2
weeks

Baader
Diagonal mirror Maxbright Universal 90° T2
$ 241.00
ready for shipping in 1-2
weeks

Baader
Zenith prism T-2/90° 32mm prism
$ 120.00
ready for shipping in 3-7
days

Starlight Xpress
Camera Trius PRO-825 Mono
$ 1,770.00
ready for shipping in 24
h

TS Optics
T2 extension tube, 5mm optical path
$ 22.90
ready for shipping in 3-7
days

TS Optics
T2 extension ring, optical path 20mm
$ 23.90
ready for shipping in 3-7
days

TS Optics
T2 extension ring, optical path 3mm
$ 22.90
ready for shipping in 3-7
days