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.
![William Optics Camera adaptor T-Ring Nikon Z 48mm](/Produktbilder/normal/73977_1/William-Optics-Camera-adaptor-T-Ring-Nikon-Z-48mm.jpg)
William Optics
Camera adaptor T-Ring Nikon Z 48mm
$ 84.00
![Baader Adaptors 1.25"/T2](/Produktbilder/normal/77102_1/Baader-Adaptors-1-25-T2.jpg)
Baader
Adaptors 1.25"/T2
$ 34.90
![Baader Adaptors 2"/T2](/Produktbilder/normal/75443_1/Baader-Adaptors-2-T2.jpg)
Baader
Adaptors 2"/T2
$ 51.00
![William Optics Camera adaptor T-Ring Fuji FX 48mm](/Produktbilder/normal/73841_1/William-Optics-Camera-adaptor-T-Ring-Fuji-FX-48mm.jpg)
William Optics
Camera adaptor T-Ring Fuji FX 48mm
$ 77.00
![Pierro Astro Adapter Canon EOS - T2 mit ZWO Filterhalterung](/Produktbilder/normal/80411_1/Pierro-Astro-Adapter-Canon-EOS-T2-mit-ZWO-Filterhalterung.jpg)
Pierro Astro
Adapter Canon EOS - T2 mit ZWO Filterhalterung
$ 152.00
![Omegon Finderscope to C mount adapter](/Produktbilder/normal/56472_1/Omegon-Finderscope-to-C-mount-adapter.jpg)
Omegon
Finderscope to C mount adapter
RRP:
$ 29.00
Our price:
$ 23.90
![TS Optics Camera adaptor M48/Canon EOS R & EOS RP](/Produktbilder/normal/80163_1/TS-Optics-Camera-adaptor-M48-Canon-EOS-R-EOS-RP.jpg)
TS Optics
Camera adaptor M48/Canon EOS R & EOS RP
$ 44.90
![Omegon finderscope to T adapter](/Produktbilder/normal/56473_1/Omegon-finderscope-to-T-adapter.jpg)
Omegon
finderscope to T adapter
$ 14.90
![William Optics Camera adaptor M48/Pentax K](/Produktbilder/normal/75487_1/William-Optics-Camera-adaptor-M48-Pentax-K.jpg)
William Optics
Camera adaptor M48/Pentax K
$ 72.00
![Omegon Projection adapter Focusing set M42](/Produktbilder/normal/22016_1/Omegon-Projection-adapter-Focusing-set-M42.jpg)
Omegon
Projection adapter Focusing set M42
$ 48.90
![Celestron RASA 8 suitable for Sony cameras](/Produktbilder/normal/78043_1/Celestron-RASA-8-suitable-for-Sony-cameras.jpg)
Celestron
RASA 8 suitable for Sony cameras
$ 99.00
![Baader Adaptors 2"/M54](/Produktbilder/normal/79874_1/Baader-Adaptors-2-M54.jpg)
Baader
Adaptors 2"/M54
$ 42.90
![Baader Camera adaptor T2/Leica, Sigma, Panasonic-L & S52 Wide-T](/Produktbilder/normal/76695_1/Baader-Camera-adaptor-T2-Leica-Sigma-Panasonic-L-S52-Wide-T.jpg)
Baader
Camera adaptor T2/Leica, Sigma, Panasonic-L & S52 Wide-T
$ 37.90
![Baader Flip mirror BFM II](/Produktbilder/normal/63172_1/Baader-Flip-mirror-BFM-II.jpg)
Baader
Flip mirror BFM II
$ 254.00
![Pierro Astro Camera adaptor Kamera-Adapter 50,80mm auf T2 und M48 für Barlow](/Produktbilder/normal/76616_1/Pierro-Astro-Camera-adaptor-Kamera-Adapter-50-80mm-auf-T2-und-M48-fuer-Barlow.jpg)
Pierro Astro
Camera adaptor Kamera-Adapter 50,80mm auf T2 und M48 für Barlow
$ 55.00
![Omegon Adaptors T2-M48-Adapter 16.5mm](/img5b29d2a57/products/product_placeholder_300x300.png)
Omegon
Adaptors T2-M48-Adapter 16.5mm
$ 19.90
![TS Optics Rotator 360° M63](/Produktbilder/normal/80293_1/TS-Optics-Rotator-360d-M63.jpg)
TS Optics
Rotator 360° M63
$ 133.00
Sale price:
$ 110.10
![PrimaLuceLab M56x1 Adapter für ARCO 2"](/Produktbilder/normal/77030_1/PrimaLuceLab-M56x1-Adapter-fuer-ARCO-2-.jpg)
PrimaLuceLab
M56x1 Adapter für ARCO 2"
$ 55.00
![TS Optics Camera adaptor T2/Sony Alpha & Minolta](/Produktbilder/normal/76374_1/TS-Optics-Camera-adaptor-T2-Sony-Alpha-Minolta.jpg)
TS Optics
Camera adaptor T2/Sony Alpha & Minolta
$ 41.90
![Pierro Astro Adapter-Ring Canon EOS - M54 für ASI 2400 / 2600 oder 6200](/Produktbilder/normal/80412_1/Pierro-Astro-Adapter-Ring-Canon-EOS-M54-fuer-ASI-2400-2600-oder-6200.jpg)
Pierro Astro
Adapter-Ring Canon EOS - M54 für ASI 2400 / 2600 oder 6200
$ 97.00
![TS Optics Adapter M54/M63](/Produktbilder/normal/76770_1/TS-Optics-Adapter-M54-M63.jpg)
TS Optics
Adapter M54/M63
$ 66.00
![Baader Camera adaptor T2/Nikon & S52 Wide-T](/Produktbilder/normal/74225_3/Baader-Camera-adaptor-T2-Nikon-S52-Wide-T.jpg)
Baader
Camera adaptor T2/Nikon & S52 Wide-T
$ 37.90
![Baader Camera adaptor T2/Minolta AF &S52 Wide-T](/Produktbilder/normal/74196_3/Baader-Camera-adaptor-T2-Minolta-AF-S52-Wide-T.jpg)
Baader
Camera adaptor T2/Minolta AF &S52 Wide-T
$ 37.90
![Celestron RASA 8 suitable for Canon cameras](/Produktbilder/normal/78044_1/Celestron-RASA-8-suitable-for-Canon-cameras.jpg)
Celestron
RASA 8 suitable for Canon cameras
$ 99.00
![TS Optics Rotator 360° M90](/Produktbilder/normal/63650_1/TS-Optics-Rotator-360d-M90.jpg)
TS Optics
Rotator 360° M90
$ 151.00
![TS Optics Rotator 360° M68/M68](/Produktbilder/normal/78038_1/TS-Optics-Rotator-360d-M68-M68.jpg)
TS Optics
Rotator 360° M68/M68
$ 117.00
![TS Optics Adaptors 1.25"/T2](/Produktbilder/normal/4945_1/TS-Optics-Adaptors-1-25-T2.jpg)
TS Optics
Adaptors 1.25"/T2
$ 27.90
![APM Projection adapter for XWA Eyepieces](/Produktbilder/normal/72301_1/APM-Projection-adapter-for-XWA-Eyepieces.jpg)
APM
Projection adapter for XWA Eyepieces
$ 22.90
![Omegon Adaptors Adapter of 2'' on T2, optical path only 3 mm](/Produktbilder/normal/4573_1/Omegon-Adaptors-Adapter-of-2-on-T2-optical-path-only-3-mm.jpg)
Omegon
Adaptors Adapter of 2'' on T2, optical path only 3 mm
$ 34.90
![Omegon Syncfocus flip-mirror (for planetary cameras)](/Produktbilder/normal/49764_1/Omegon-Syncfocus-flip-mirror-for-planetary-cameras-.jpg)
Omegon
Syncfocus flip-mirror (for planetary cameras)
$ 69.00
![Omegon T2 ring for Minolta AF and Sony A-Mount cameras](/Produktbilder/normal/33222_1/Omegon-T2-ring-for-Minolta-AF-and-Sony-A-Mount-cameras.jpg)
Omegon
T2 ring for Minolta AF and Sony A-Mount cameras
$ 29.90
![Omegon M48 male to T2 male](/Produktbilder/normal/22012_1/Omegon-M48-male-to-T2-male.jpg)
Omegon
M48 male to T2 male
$ 29.90
![Omegon Adaptors M48 thread to 2'' adapter](/Produktbilder/normal/43915_1/Omegon-Adaptors-M48-thread-to-2-adapter.jpg)
Omegon
Adaptors M48 thread to 2'' adapter
$ 19.90
![Omegon Adaptors C-mount to 1.25'' adapter ring](/Produktbilder/normal/45778_1/Omegon-Adaptors-C-mount-to-1-25-adapter-ring.jpg)
Omegon
Adaptors C-mount to 1.25'' adapter ring
$ 11.90
![Omegon Adaptors 1.25'', 30mm extension tube](/Produktbilder/normal/33232_1/Omegon-Adaptors-1-25-30mm-extension-tube.jpg)
Omegon
Adaptors 1.25'', 30mm extension tube
$ 24.90
![Omegon flip mirror](/Produktbilder/normal/33138_1/Omegon-flip-mirror.jpg)