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
Artesky
Adapter Twist Lock 2" (Skywatcher Newton)
$ 115.00
Baader
Adapter 2" M54 ClickLock clamp
$ 102.00
Omegon
2'' to 1.25" reducer adapter
$ 34.90
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"
$ 23.90
Celestron
Adapter SCT Visual Back 1,25"
$ 33.90
TS Optics
Adapter Adaptors M82/M48
RRP:
$ 58.00
Our price:
$ 49.90
ASToptics
Easy Grip Twist-Lock adapter (M48 to 1.25")
$ 80.00
Sale price:
$ 55.41
ASToptics
Easy-Grip Twist-Lock adapter (M42 to 1.25")
$ 80.00
Skywatcher
Adapter Twist Lock 2"/1,25"
$ 35.90
Baader
Adapter 2" ClickLock SCL clamp (C11-C14) for large SC telescopes
$ 117.00
Baader
Adapter Reducing piece S52 / M48
$ 28.90
ASToptics
72mm to M48 adapter, 2"
$ 28.90
PrimaLuceLab
Adapter M60 / M48
$ 145.00
Explore Scientific
Adapter 3" Flattener/Reducer to M48x0.75
$ 41.90
TS Optics
Adapter M63 / M48
RRP:
$ 69.00
Our price:
$ 52.00
TS Optics
Adapter for the attachment of 2'' at T2
$ 40.90
Baader
Adapter M48 adaptor for Diamond Steeltrack BDS
$ 33.90
Sale price:
$ 23.02
TS Optics
SC/T2 adapter
$ 56.00
TS Optics
Adapter Adaptors M48 / T2 6mm
$ 27.90
TS Optics
Adapter Adaptors M68/M63
$ 58.00
iOptron
Adapter M56 / M48
$ 34.90
Adapter M117 / M48
$ 127.00
TS Optics
65mm to M48 female thread adapter
$ 93.00
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
Pierro Astro
Adapter from big SC-thread (3.3") to standard SC-thread (2")
$ 69.00
TS Optics
Adapter SC female thread to M48 male thread
$ 51.00
Baader
Adapter ClickLock Clamp M68x0.75 (Hexafoc) / 2"
$ 115.00
Baader
Adapter of M82 on M68
$ 59.00
Baader
Adapter ClickLock M74/2"
$ 129.00
Baader
Adapter ClickLock Clamp 2" M54i x 0.75
$ 97.00
