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
Omegon
2'' extension tube with 50mm optical path
$ 39.90
Omegon
2'' extension tube, 80mm optical path
$ 49.90
Explore Scientific
Extension tube M48 set
$ 65.00
Omegon
2'' adapters with reducer 1.25 ''
$ 29.90
ASToptics
M54 (Female) to M48 (Male) adapter
$ 34.90
Omegon
2'' Twist-lock adapter
$ 99.00
Omegon
T2 to 1.25'' adapter
$ 29.90
Artesky
Adapter Twist Lock 2" (Skywatcher Newton)
$ 116.00
Omegon
40mm T2i/T2a T2 extension ring
$ 24.90
Omegon
Adapter T-Adaptors M54(m)/T2(m)
$ 24.90
Baader
ClickLock 2" to 1.25" reducer adapter
$ 98.00
PegasusAstro
Adapter M54 Male - M54 Male
$ 34.90
Omegon
2'' to 1.25" reducer adapter
$ 39.90
ASToptics
Extension tube M48 Fine tuning Kit - 0.5mm; 0.8mm; 1mm
$ 29.90
ASToptics
Extension Tube M48 Filter thread - 4mm Length
$ 23.90
Omegon
T2 extension tube - 30mm
$ 19.90
Omegon
Extension tube 45mm Extender 2''
$ 29.90
ZWO
T2 / C mount adapter
$ 29.90
Omegon
Adapter 2'' T2 Adaptors with 1.25'' Reducer
RRP:
$ 64.80
Our price:
$ 49.90
ASToptics
M42 (FEMALE) TO M42 (FEMALE) adapter, 10MM
$ 29.90
Omegon
7.5 mm T2i/T2a T2 extension ring
$ 19.90
Baader
Adapter 2" M54 ClickLock clamp
$ 103.00
Baader
Extension tube Fine-Adjustment rings M54 0,3 / 0,5 / 1 mm
$ 27.90
ZWO
Adapter M54 to M48
$ 20.90
ASToptics
Extension tube M48 - Filter thread - 5mm long
$ 23.90
ASToptics
T2 ADAPTER FOR TELEVUE POWERMATE 2.5X/5X
$ 59.00
Baader
Extension tube Hyperion Finetuning ring 14mm
$ 24.90
ASToptics
M48(M) to 1.25" filter(F) adapter
$ 17.90
Baader
Extension tube M54 10mm
$ 46.90
Omegon
2" extension tube
$ 19.90
TS Optics
Adapter for the attachment of 2'' at T2
$ 40.90
Omegon
Extension tube Extender 30 mm T- thread
$ 29.90
