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 ''
$ 24.90
Omegon
2'' - 1.25'' Twist-lock adapter
$ 79.00
Baader
Adapter 2" M54 ClickLock clamp
$ 102.00
Artesky
Adapter Twist Lock 2" (Skywatcher Newton)
$ 115.00
Omegon
2'' to 1.25" reducer adapter
$ 34.90
Lunt Solar Systems
Lunt T2 to 2" blocking filter adapter
$ 161.00
Celestron
Adapter SCT Visual Back 1,25"
$ 33.90
Explore Scientific
Adapter 3" Flattener/Reducer to M48x0.75
$ 41.90
Omegon
Adapter 2'' T2 Adaptors with 1.25'' Reducer
RRP:
$ 59.80
Our price:
$ 49.00
ASToptics
Adapter adaptors from 55 mm to M48 2"
$ 22.90
ASToptics
Easy Grip Twist-Lock adapter (M48 to 1.25")
$ 80.00
Skywatcher
Adapter Twist Lock 2"/1,25"
$ 35.90
iOptron
Adapter M56 / M48
$ 34.90
Baader
Adapter Reducing piece S52 / M48
$ 28.90
ASToptics
72mm to M48 adapter, 2"
$ 28.90
PrimaLuceLab
Adapter M60 / M48
$ 145.00
TS Optics
Adapter M63 / M48
RRP:
$ 69.00
Our price:
$ 52.00
Baader
Adapter M48 adaptor for Diamond Steeltrack BDS
$ 33.90
TS Optics
Adapter Adaptors M48 / T2 6mm
$ 27.90
TS Optics
Adapter Adaptors M68/M63
$ 58.00
Adapter M117 / M48
$ 126.00
TS Optics
Adapter Adaptors M117/M90
$ 103.00
Baader
Adapter M48 / T2
$ 34.90
Baader
Adapter 2" ClickLock M68 clamp for ZEISS APQ fluorite APOs
$ 107.00
iOptron
Adapter M74 / M68
$ 34.90
TS Optics
Adapter SC female thread to M48 male thread
$ 51.00
Baader
Adapter ClickLock Clamp M68x0.75 (Hexafoc) / 2"
$ 115.00
Baader
Adapter ClickLock M74/2"
$ 129.00
Baader
Adapter ClickLock Clamp 2" M54i x 0.75
$ 96.00
TS Optics
Adapter Adaptors M74 / M68
$ 86.00
PegasusAstro
Adapter M68 / M63
$ 32.90
Baader
Adapter ClickLock M54/2"
$ 111.00
Baader
Adapter 2" M56 ClickLock clamp
$ 100.00
ASToptics
Easy-Grip Twist-Lock Adapter (2" to 1.25")
$ 80.00
ASToptics
Easy-Grip Twist-Lock adapter (M42 to 1.25")
$ 80.00
