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.
noctutec
Electronic collimator OCAL V4.0
( 5 / 5 )
$ 334.00
ready for shipping in 24
h
Omegon
40mm T2i/T2a T2 extension ring
$ 24.90
ready for shipping in 24
h
ASToptics
Adapter Reversion ring with 10mm M42x0.75 internal thread
$ 34.90
ready for shipping in 24
h
ZWO
Helical Focuser 1.25"
( 5 / 5 )
$ 115.00
ready for shipping in 24
h
ASToptics
T2 extension tube - 6mm long
$ 34.90
ready for shipping in 24
h
Baader
T2/1.25" ultrashort adapter
$ 36.90
ready for shipping in 24
h
ASToptics
T2 Extension tube - 5mm long
$ 17.90
ready for shipping in 24
h
PegasusAstro
Adapter M54 Male - M48 Female
$ 46.90
ready for shipping in 24
h
Omegon
7.5 mm T2i/T2a T2 extension ring
$ 21.90
ready for shipping in 24
h
Baader
Extension tube Fine Tuning Ring Set T2 0.3 / 0.5 / 1mm
$ 24.90
ready for shipping in 24
h
TS Optics
short T2 Helical Focuser & Adapter
RRP:
$ 115.00
Our price:
$ 80.00
ready for shipping in 3-7
days
ASToptics
T2 extension tube - 7mm long
$ 16.90
ready for shipping in 24
h
Omegon
T-thread Extension and 2'' nosepiece 21mm
$ 24.90
ready for shipping in 24
h
ZWO
T2 / C mount adapter
$ 28.90
ready for shipping in 24
h
ASToptics
1.25" helical focuser (M42/T2)
$ 115.00
ready for shipping in 24
h
Baader
Adapter Eyepiece clamp ClickLock 1 ¼"/T-2i
$ 101.00
ready for shipping in 1-2
weeks
Omegon
T2 extension tube - 30mm
$ 22.90
ready for shipping in 24
h
Baader
Extension tube Fine Tuning Ring Set T2
$ 21.90
ready for shipping in 1-2
weeks
ASToptics
T2 extension tube - 9mm in length
$ 34.90
ready for shipping in 24
h
Omegon
T2 adapter ring, 7mm (female/female)
$ 34.90
ready for shipping in 24
h
Omegon
adapter ring M48-T2 0mm
$ 24.90
Product can be shipped as of 15.11.2025
TS Optics
T2 extension ring, optical path 20mm
$ 25.90
ready for shipping in 3-7
days
ASToptics
T2 extension tube - 12mm long
$ 21.90
ready for shipping in 3-7
days
Baader
Adapter Focusing T-2 eyepiece clamp 1 1/4 "
$ 54.00
ready for shipping in 1-2
weeks
Omegon
15mm T2i/T2a T2 extension ring
$ 21.90
ready for shipping in 24
h
PegasusAstro
Adapter M54 Male - M42 Male
$ 46.90
ready for shipping in 1-2
weeks
Baader
Diagonal mirror Maxbright Universal 90° T2
$ 257.00
ready for shipping in 1-2
weeks
ASToptics
Extension tube T2 fine-tuning ring - 0.5mm (aluminium)
$ 11.90
ready for shipping in 1-2
weeks
ASToptics
T2 extension tube - 4mm long
$ 28.90
ready for shipping in 24
h
TS Optics
Extension tube T2 10mm
$ 24.90
ready for shipping in 24
h
TS Optics
Diagonal prism T2 90°
$ 103.00
ready for shipping in 3-7
days
ASToptics
T2 extension tube - 15mm long
$ 22.90
ready for shipping in 24
h
Omegon
Extension tube Extender 30 mm T- thread
$ 29.90
Sale price:
$ 18.90
ready for shipping in 24
h
TS Optics
T2 extension ring, optical path 3mm
$ 24.90
ready for shipping in 3-7
days
TS Optics
Adapter 1.25" Filter Holder for T2-threads
$ 39.90
ready for shipping in 3-7
days
Baader
Binocular head MaxBright II 2x 32mm Classic Ortho 1.25"
$ 640.00
ready for shipping in 1-2
weeks