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'' adapters with reducer 1.25 ''](/Produktbilder/normal/1044_1/Omegon-2-adapters-with-reducer-1-25-.jpg)
Omegon
2'' adapters with reducer 1.25 ''
$ 29.90
![ASToptics 2" adapter for 55mm to M48](/Produktbilder/normal/57818_1/ASToptics-2-adapter-for-55mm-to-M48.jpg)
ASToptics
2" adapter for 55mm to M48
$ 16.90
![ASToptics 82mm to M48 adapter (2")](/Produktbilder/normal/57937_1/ASToptics-82mm-to-M48-adapter-2-.jpg)
ASToptics
82mm to M48 adapter (2")
$ 16.90
![William Optics SCT connection for WO Diagonals](/Produktbilder/normal/65327_2/William-Optics-SCT-connection-for-WO-Diagonals.jpg)
William Optics
SCT connection for WO Diagonals
$ 66.00
![ASToptics Easy-Grip Twist-Lock Adapter (2" to 1.25")](/Produktbilder/normal/57894_1/ASToptics-Easy-Grip-Twist-Lock-Adapter-2-to-1-25-.jpg)
ASToptics
Easy-Grip Twist-Lock Adapter (2" to 1.25")
$ 77.00
![Omegon 2'' to 1.25" reducer adapter](/Produktbilder/normal/33229_1/Omegon-2-to-1-25-reducer-adapter.jpg)
Omegon
2'' to 1.25" reducer adapter
$ 39.90
![ASToptics M54 (Female) to M48 (Male) adapter](/Produktbilder/normal/57906_1/ASToptics-M54-Female-to-M48-Male-adapter.jpg)
ASToptics
M54 (Female) to M48 (Male) adapter
$ 33.90
![Omegon 2'' - 1.25'' Twist-lock adapter](/Produktbilder/normal/45633_1/Omegon-2-1-25-Twist-lock-adapter.jpg)
Omegon
2'' - 1.25'' Twist-lock adapter
$ 79.00
![Explore Scientific M48/T2 adapter](/Produktbilder/normal/68621_1/Explore-Scientific-M48-T2-adapter.jpg)
Explore Scientific
M48/T2 adapter
$ 27.90
![ASToptics M48(M) to 1.25" filter(F) adapter](/Produktbilder/normal/57665_1/ASToptics-M48-M-to-1-25-filter-F-adapter.jpg)
ASToptics
M48(M) to 1.25" filter(F) adapter
$ 16.90
![ASToptics 1.25" eyepiece to 0.965 focuser adapter](/Produktbilder/normal/57678_1/ASToptics-1-25-eyepiece-to-0-965-focuser-adapter.jpg)
ASToptics
1.25" eyepiece to 0.965 focuser adapter
$ 38.90
![ASToptics M42 (FEMALE) TO M42 (FEMALE) adapter, 10MM](/Produktbilder/normal/57912_1/ASToptics-M42-FEMALE-TO-M42-FEMALE-adapter-10MM.jpg)
ASToptics
M42 (FEMALE) TO M42 (FEMALE) adapter, 10MM
$ 27.90
![ASToptics M56x0.75 (F) to M48x0.75 (M) adapter](/Produktbilder/normal/57885_1/ASToptics-M56x0-75-F-to-M48x0-75-M-adapter.jpg)
ASToptics
M56x0.75 (F) to M48x0.75 (M) adapter
$ 33.90
![OPT Radian Raptor 61 Visual Back](/Produktbilder/normal/70687_1/OPT-Radian-Raptor-61-Visual-Back.jpg)
OPT
Radian Raptor 61 Visual Back
$ 111.00
![ASToptics 36mm filter to 2" adapter (M48x0.75)](/Produktbilder/normal/57789_1/ASToptics-36mm-filter-to-2-adapter-M48x0-75-.jpg)
ASToptics
36mm filter to 2" adapter (M48x0.75)
$ 33.90
![ASToptics 72mm to M48 adapter, 2"](/Produktbilder/normal/57823_1/ASToptics-72mm-to-M48-adapter-2-.jpg)
ASToptics
72mm to M48 adapter, 2"
$ 16.90
![Omegon 2'' Twist-lock adapter](/Produktbilder/normal/45635_1/Omegon-2-Twist-lock-adapter.jpg)
Omegon
2'' Twist-lock adapter
$ 99.00
![ASToptics Easy Grip Twist-Lock adapter (M48 to 1.25")](/Produktbilder/normal/57896_1/ASToptics-Easy-Grip-Twist-Lock-adapter-M48-to-1-25-.jpg)
ASToptics
Easy Grip Twist-Lock adapter (M48 to 1.25")
$ 77.00
![ASToptics T2 ADAPTER FOR TELEVUE POWERMATE 2.5X/5X](/Produktbilder/normal/57774_1/ASToptics-T2-ADAPTER-FOR-TELEVUE-POWERMATE-2-5X-5X.jpg)
ASToptics
T2 ADAPTER FOR TELEVUE POWERMATE 2.5X/5X
$ 56.00
![ASToptics M36X0.75 to 1.25" adapter](/Produktbilder/normal/57893_1/ASToptics-M36X0-75-to-1-25-adapter.jpg)
ASToptics
M36X0.75 to 1.25" adapter
$ 22.90
![ASToptics Easy-Grip Twist-Lock adapter (M42 to 1.25")](/Produktbilder/normal/57895_1/ASToptics-Easy-Grip-Twist-Lock-adapter-M42-to-1-25-.jpg)
ASToptics
Easy-Grip Twist-Lock adapter (M42 to 1.25")
$ 77.00
![ASToptics M42 MALE TO 1.25"/ T2 ADAPTER](/Produktbilder/normal/57918_1/ASToptics-M42-MALE-TO-1-25-T2-ADAPTER.jpg)
ASToptics
M42 MALE TO 1.25"/ T2 ADAPTER
$ 66.00
![DayStar Eyepiece Holder for Quark 2"](/Produktbilder/normal/53980_1/DayStar-Eyepiece-Holder-for-Quark-2-.jpg)
DayStar
Eyepiece Holder for Quark 2"
$ 111.00
![Lumicon 1.25" Male - 0.965" Female Reducer](/Produktbilder/normal/6844_1/Lumicon-1-25-Male-0-965-Female-Reducer.jpg)
Lumicon
1.25" Male - 0.965" Female Reducer
$ 49.90
![Optec Adapter T2/ & Lepus 2"](/Produktbilder/normal/49433_1/Optec-Adapter-T2-Lepus-2-.jpg)
Optec
Adapter T2/ & Lepus 2"
$ 166.00
![Starlight Instruments Takahashi FS128 tube adapter ring](/Produktbilder/normal/20552_1/Starlight-Instruments-Takahashi-FS128-tube-adapter-ring.jpg)
Starlight Instruments
Takahashi FS128 tube adapter ring
RRP:
$ 630.00
Our price:
$ 465.00
![Howie Glatter Parallizer 2" to 1.25" reducer adapter](/Produktbilder/normal/23927_2/Howie-Glatter-Parallizer-2-to-1-25-reducer-adapter.jpg)
Howie Glatter
Parallizer 2" to 1.25" reducer adapter
$ 222.00
![Starlight Xpress M54 adapter (female) for SX USB filter wheel](/Produktbilder/normal/16794_3/Starlight-Xpress-M54-adapter-female-for-SX-USB-filter-wheel.jpg)
Starlight Xpress
M54 adapter (female) for SX USB filter wheel
$ 56.00
![Starlight Xpress M54 adapter (male) for SX USB filter wheel](/Produktbilder/normal/16794_3/Starlight-Xpress-M54-adapter-male-for-SX-USB-filter-wheel.jpg)
Starlight Xpress
M54 adapter (male) for SX USB filter wheel
$ 56.00
![Starlight Xpress M48 adapter (female) for SX USB filter wheel](/Produktbilder/normal/16794_3/Starlight-Xpress-M48-adapter-female-for-SX-USB-filter-wheel.jpg)
Starlight Xpress
M48 adapter (female) for SX USB filter wheel
$ 56.00
![Starlight Xpress M48 adapter (male) for SX USB filter wheel](/Produktbilder/normal/16794_3/Starlight-Xpress-M48-adapter-male-for-SX-USB-filter-wheel.jpg)
Starlight Xpress
M48 adapter (male) for SX USB filter wheel
$ 56.00
![Starlight Xpress M52 adapter (female) for SX USB filter wheel](/Produktbilder/normal/16794_3/Starlight-Xpress-M52-adapter-female-for-SX-USB-filter-wheel.jpg)
Starlight Xpress
M52 adapter (female) for SX USB filter wheel
$ 56.00
![Starlight Xpress M56 adapter (female) for SX USB filter wheel](/Produktbilder/normal/16794_3/Starlight-Xpress-M56-adapter-female-for-SX-USB-filter-wheel.jpg)
Starlight Xpress
M56 adapter (female) for SX USB filter wheel
$ 56.00
![Starlight Xpress M56 adapter (male) for SX USB filter wheel](/Produktbilder/normal/16794_3/Starlight-Xpress-M56-adapter-male-for-SX-USB-filter-wheel.jpg)
Starlight Xpress
M56 adapter (male) for SX USB filter wheel
$ 56.00
![Starlight Xpress M52 adapter (male) for SX USB filter wheel](/Produktbilder/normal/16794_3/Starlight-Xpress-M52-adapter-male-for-SX-USB-filter-wheel.jpg)
Starlight Xpress
M52 adapter (male) for SX USB filter wheel
$ 56.00
![APM FastLock M68/2"](/Produktbilder/normal/70035_1/APM-FastLock-M68-2-.jpg)