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
2'' - 1.25'' Twist-lock adapter
$ 79.00
Omegon
1.25'', 30mm extension tube
$ 19.90
Explore Scientific
Extension tube M48 set
$ 65.00
Omegon
2'' extension tube with 50mm optical path
$ 39.90
Omegon
2'' extension tube, 80mm optical path
$ 49.90
ASToptics
M54 (Female) to M48 (Male) adapter
$ 35.90
Omegon
2'' Twist-lock adapter
$ 99.00
Omegon
T2 to 1.25'' adapter
$ 29.90
Artesky
Adapter Twist Lock 2" (Skywatcher Newton)
$ 117.00
Omegon
40mm T2i/T2a T2 extension ring
$ 24.90
ASToptics
Extension tube M48 Fine tuning Kit - 0.5mm; 0.8mm; 1mm
$ 29.90
Omegon
Adapter 2'' T2 Adaptors with 1.25'' Reducer
RRP:
$ 64.80
Our price:
$ 49.90
Omegon
Adapter T-Adaptors M54(m)/T2(m)
$ 24.90
PegasusAstro
Adapter M54 Male - M54 Male
$ 35.90
Omegon
Extension tube 45mm Extender 2''
$ 29.90
ASToptics
Extension Tube M48 Filter thread - 4mm Length
$ 23.90
Omegon
2'' adapters with reducer 1.25 ''
$ 29.90
Omegon
2'' to 1.25" reducer adapter
$ 39.90
Baader
ClickLock 2" to 1.25" reducer adapter
$ 98.00
Omegon
T2 extension tube - 30mm
$ 19.90
ZWO
T2 / C mount adapter
$ 29.90
ASToptics
M42 (FEMALE) TO M42 (FEMALE) adapter, 10MM
$ 29.90
Omegon
7.5 mm T2i/T2a T2 extension ring
$ 19.90
ASToptics
T2 extension tube - 6mm long
$ 29.90
ASToptics
Extension tube M48 - Filter thread - 5mm long
$ 23.90
ASToptics
T2 ADAPTER FOR TELEVUE POWERMATE 2.5X/5X
$ 59.00
ASToptics
M48(M) to 1.25" filter(F) adapter
$ 17.90
Omegon
2" extension tube
$ 19.90
Baader
Extension tube Fine-Adjustment rings M54 0,3 / 0,5 / 1 mm
$ 28.90
Omegon
15mm T2i/T2a T2 extension ring
$ 24.90
Baader
Adapter Focusing T-2 eyepiece clamp 1 1/4 "
$ 55.00
Omegon
Extension tube Extender 30 mm T- thread
$ 29.90
ZWO
Adapter M54 Adaptors for Filter Drawer
$ 41.90
ASToptics
M54*0.75 - 8mm extension ring
$ 35.90
