The world of adapters is diverse and not easy to understand. This is due to the wide variety of thread and plug sizes that optics and accessories may have.
In astronomy, two plug sizes have become established, which are often indicated in the old unit inches ("):
- 1.25" corresponds to 31.8 millimetre
- 2" corresponds to 50.8 millimetres
Many eyepieces, but also cameras, have connectors in one of these two sizes, which can be inserted into the telescope’s focuser.
If a 1.25" connector is to be inserted in a focuser with a 2" connector, a 1.25"/2" adapter is required. This is an example of a reducer adapter: where a connection is reduced from a larger size to a smaller one. The reverse is called an extension adapter.
Another very important category of adapters is camera adapters. These are used to connect cameras to optics or to accessories. The T2 thread (M42x0.75), which enables a screw connection, is very well established for this purpose. Lighter cameras without many accessories can also be easily connected to the telescope via a socket.
For astrophotography it is important that the aperture is large enough to illuminate the sensor (no vignetting) and the optical length matches the focal point.
Omegon
2“ Extension tube, 35mm optical path
$ 29.90
Omegon
1.25'', 30mm extension tube
$ 22.90
Omegon
2'' adapters with reducer 1.25 ''
$ 24.90
Omegon
2'' extension tube with 50mm optical path
$ 34.90
Omegon
2'' - 1.25'' Twist-lock adapter
$ 79.00
Omegon
2'' extension tube, 80mm optical path
$ 44.90
Explore Scientific
Extension tube M48 set
$ 64.00
ASToptics
M54 (Female) to M48 (Male) adapter
$ 40.90
Omegon
T2 to 1.25'' adapter
$ 29.90
Omegon
40mm T2i/T2a T2 extension ring
$ 24.90
Omegon
Adapter T-Adaptors M54(m)/T2(m)
$ 24.90
Artesky
Adapter Twist Lock 2" (Skywatcher Newton)
$ 115.00
ASToptics
Extension tube M48 Fine tuning Kit - 0.5mm; 0.8mm; 1mm
$ 34.90
Omegon
2'' Twist-lock adapter
$ 99.00
Omegon
Extension tube 45mm Extender 2''
$ 34.90
Baader
ClickLock 2" to 1.25" reducer adapter
$ 97.00
PegasusAstro
Adapter M54 Male - M54 Male
$ 34.90
ASToptics
Extension Tube M48 Filter thread - 4mm Length
$ 28.90
ZWO
Adapter M54 / M48
$ 27.90
ZWO
Adapter M54 Adaptors for Filter Drawer
$ 34.90
ASToptics
Adapter Reversion ring with 10mm M42x0.75 internal thread
$ 34.90
Omegon
2'' to 1.25" reducer adapter
$ 34.90
Baader
Adapter 2" M54 ClickLock clamp
$ 102.00
ZWO
T2 / C mount adapter
$ 28.90
Baader
Extension tube Fine-Adjustment rings M54 0,3 / 0,5 / 1 mm
$ 27.90
Omegon
Adapter 2'' T2 Adaptors with 1.25'' Reducer
RRP:
$ 59.00
Our price:
$ 49.00
ASToptics
M54*0.75 - 5MM extension ring
$ 40.90
Omegon
adapter ring M48-T2 0mm
$ 24.90
Omegon
7.5 mm T2i/T2a T2 extension ring
$ 21.90
Baader
Extension tube Fine Tuning Ring Set T2 0.3 / 0.5 / 1mm
$ 24.90
Omegon
T2 extension tube - 30mm
$ 22.90
ASToptics
T2 ADAPTER FOR TELEVUE POWERMATE 2.5X/5X
$ 69.00
Baader
Extension tube Hyperion Finetuning ring 14mm
$ 24.90
ASToptics
72mm to M48 adapter, 2"
$ 26.90
ASToptics
M48(M) to 1.25" filter(F) adapter
$ 25.90
