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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.

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Omegon 40mm T2i/T2a T2 extension ring
Omegon
40mm T2i/T2a T2 extension ring
$ 24.90
ready for shipping in 24 h
Omegon 7.5 mm T2i/T2a T2 extension ring
Omegon
7.5 mm T2i/T2a T2 extension ring
$ 19.90
ready for shipping in 24 h
Omegon Extension tube Extender 30 mm T- thread
Omegon
Extension tube Extender 30 mm T- thread
$ 29.90
ready for shipping in 24 h
Omegon 15mm T2i/T2a T2 extension ring
Omegon
15mm T2i/T2a T2 extension ring
$ 24.90
ready for shipping in 24 h
ASToptics T2 extension tube - 30mm
ASToptics
T2 extension tube - 30mm
$ 20.90
ready for shipping in 24 h
Omegon T-thread Extension and 2'' nosepiece 21mm
Omegon
T-thread Extension and 2'' nosepiece 21mm
$ 19.90
ready for shipping in 24 h
ASToptics Extension tube T2 Fine tuning Kit - 0.5mm; 0.8mm; 1mm
ASToptics
Extension tube T2 Fine tuning Kit - 0.5mm; 0.8mm; 1mm
$ 25.90
ready for shipping in 24 h
ASToptics T2 extension tube - 7mm long
ASToptics
T2 extension tube - 7mm long
$ 25.90
ready for shipping in 24 h
ASToptics T2 extension tube - 6mm long
ASToptics
T2 extension tube - 6mm long
$ 25.90
ready for shipping in 24 h
Omegon Extension tube Extender 7 mm T-thread
Omegon
Extension tube Extender 7 mm T-thread
$ 29.90
ready for shipping in 24 h
ASToptics T2 extension tube - 9mm in length
ASToptics
T2 extension tube - 9mm in length
$ 25.90
ready for shipping in 24 h
ASToptics T2 extension tube - 4mm long
ASToptics
T2 extension tube - 4mm long
$ 20.90
ready for shipping in 24 h
ASToptics T2 Extension tube - 5mm long
ASToptics
T2 Extension tube - 5mm long
$ 20.90
ready for shipping in 24 h
Omegon Extension tube Extender 17 mm T-thread
Omegon
Extension tube Extender 17 mm T-thread
$ 29.90
ready for shipping in 24 h
TS Optics T2 extension ring, optical path 3mm
TS Optics
T2 extension ring, optical path 3mm
$ 19.90
ready for shipping in 24 h
TS Optics T2 extension tube, 5mm optical path
TS Optics
T2 extension tube, 5mm optical path
$ 19.90
ready for shipping in 24 h
ASToptics Extension tube T2 fine tuning ring - 1mm (aluminium)
ASToptics
Extension tube T2 fine tuning ring - 1mm (aluminium)
$ 10.90
ready for shipping in 24 h
Baader Extension tube Fine Tuning Ring Set T2 0.3 / 0.5 / 1mm
Baader
Extension tube Fine Tuning Ring Set T2 0.3 / 0.5 / 1mm
$ 18.90
ready for shipping in 24 h
Baader Extension tube VariLock 46 lockable T-2 29-46mm extender, with lock spanner
Baader
Extension tube VariLock 46 lockable T-2 29-46mm extender, with lock spanner
$ 76.00
ready for shipping in 24 h
Baader Extension tube Fine Tuning Ring Set T2
Baader
Extension tube Fine Tuning Ring Set T2
$ 14.90
ready for shipping in 24 h
ASToptics Extension tube T2 fine-tuning ring - 0.5mm (aluminium)
ASToptics
Extension tube T2 fine-tuning ring - 0.5mm (aluminium)
$ 8.90
ready for shipping in 24 h
ASToptics T2 extension tube - 12mm long
ASToptics
T2 extension tube - 12mm long
$ 20.90
ready for shipping in 24 h
ASToptics T2 extension tube - 8mm long
ASToptics
T2 extension tube - 8mm long
$ 25.90
ready for shipping in 24 h
ASToptics T2 extension tube - 15mm long
ASToptics
T2 extension tube - 15mm long
$ 20.90
ready for shipping in 24 h
TS Optics Extension tube T2 10mm
TS Optics
Extension tube T2 10mm
$ 19.90
ready for shipping in 24 h
ASToptics T-Thread extension kit / 7mm
ASToptics
T-Thread extension kit / 7mm
$ 52.00
ready for shipping in 24 h
Baader Extension tube T-2 intermediate ring 7.5 mm T-2i/T-2a
Baader
Extension tube T-2 intermediate ring 7.5 mm T-2i/T-2a
$ 22.90
ready for shipping in 24 h
TS Optics T2 extension ring, optical path 20mm
TS Optics
T2 extension ring, optical path 20mm
$ 20.90
ready for shipping in 3-7 days
Celestron Extension tube T2 Set
Celestron
Extension tube T2 Set
$ 72.00
ready for shipping in 1-2 weeks
Baader Extension tube VariLock 29 lockable T-2 20-29mm extender, with lock spanner
Baader
Extension tube VariLock 29 lockable T-2 20-29mm extender, with lock spanner
$ 72.00
ready for shipping in 1-2 weeks
ASToptics Extension tube T2 fine tuning ring - 0.3mm (aluminium)
ASToptics
Extension tube T2 fine tuning ring - 0.3mm (aluminium)
$ 6.90
ready for shipping in 1-2 weeks
ASToptics Extension tube T2 fine tuning ring - 2mm (aluminium)
ASToptics
Extension tube T2 fine tuning ring - 2mm (aluminium)
$ 6.90
ready for shipping in 1-2 weeks
Baader Extension tube T2 40mm
Baader
Extension tube T2 40mm
$ 28.90
ready for shipping in 1-2 weeks
TS Optics Extension tube T2 26mm extender
TS Optics
Extension tube T2 26mm extender
$ 20.90
ready for shipping in 3-7 days
TS Optics T2 extension tube, 8mm optical path
TS Optics
T2 extension tube, 8mm optical path
$ 19.90
ready for shipping in 3-7 days
TS Optics Extension tube Fine Tuning Ring for T2-thread - thickness 0.5 mm
TS Optics
Extension tube Fine Tuning Ring for T2-thread - thickness 0.5 mm
$ 10.90
ready for shipping in 3-7 days