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
![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
![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
![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
![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 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
![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
![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
![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
![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
![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
![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 Camera adaptor T2-Ring compatible with Canon EOS](/Produktbilder/normal/2416_1/Omegon-Camera-adaptor-T2-Ring-compatible-with-Canon-EOS.jpg)
Omegon
Camera adaptor T2-Ring compatible with Canon EOS
$ 19.90
![Omegon Camera adaptor T2-Ring für Nikon](/Produktbilder/normal/2760_1/Omegon-Camera-adaptor-T2-Ring-fuer-Nikon.jpg)
Omegon
Camera adaptor T2-Ring für Nikon
$ 19.90
![Explore Scientific Camera adaptor M48 compatible with Canon EOS](/Produktbilder/normal/69358_1/Explore-Scientific-Camera-adaptor-M48-compatible-with-Canon-EOS.jpg)
Explore Scientific
Camera adaptor M48 compatible with Canon EOS
$ 27.90
![Explore Scientific Camera adaptor M48 compatible with Nikon](/Produktbilder/normal/69360_1/Explore-Scientific-Camera-adaptor-M48-compatible-with-Nikon.jpg)
Explore Scientific
Camera adaptor M48 compatible with Nikon
$ 27.90
![TS Optics Camera adaptor M48/Micro-Four-Thirds-Bajonett](/Produktbilder/normal/76707_1/TS-Optics-Camera-adaptor-M48-Micro-Four-Thirds-Bajonett.jpg)
TS Optics
Camera adaptor M48/Micro-Four-Thirds-Bajonett
$ 44.90
![TS Optics Camera adaptor Adapter M48/Canon EOS EF](/Produktbilder/normal/73832_1/TS-Optics-Camera-adaptor-Adapter-M48-Canon-EOS-EF.jpg)
TS Optics
Camera adaptor Adapter M48/Canon EOS EF
$ 43.90
![William Optics Camera adaptor Adapter M48 / Sony E](/Produktbilder/normal/62498_1/William-Optics-Camera-adaptor-Adapter-M48-Sony-E.jpg)
William Optics
Camera adaptor Adapter M48 / Sony E
$ 77.00
![William Optics Camera adaptor Canon EOS R T-Mount M48](/Produktbilder/normal/69831_1/William-Optics-Camera-adaptor-Canon-EOS-R-T-Mount-M48.jpg)
William Optics
Camera adaptor Canon EOS R T-Mount M48
$ 88.00
![William Optics Camera adaptor Olympus T-Mount](/Produktbilder/normal/69795_1/William-Optics-Camera-adaptor-Olympus-T-Mount.jpg)
William Optics
Camera adaptor Olympus T-Mount
$ 77.00
![William Optics Camera adaptor Adapter M48 für Canon EOS Super high precision](/Produktbilder/normal/62654_1/William-Optics-Camera-adaptor-Adapter-M48-fuer-Canon-EOS-Super-high-precision.jpg)
William Optics
Camera adaptor Adapter M48 für Canon EOS Super high precision
$ 144.00
![William Optics Camera adaptor Adapter M46 für Canon EOS](/Produktbilder/normal/65797_1/William-Optics-Camera-adaptor-Adapter-M46-fuer-Canon-EOS.jpg)
William Optics
Camera adaptor Adapter M46 für Canon EOS
$ 111.00
![William Optics Camera adaptor M48 compatible with Canon EOS](/Produktbilder/normal/63477_1/William-Optics-Camera-adaptor-M48-compatible-with-Canon-EOS.jpg)
William Optics
Camera adaptor M48 compatible with Canon EOS
$ 66.00
![William Optics Camera adaptor Adapter M48 für Nikon Super high precision](/Produktbilder/normal/62655_1/William-Optics-Camera-adaptor-Adapter-M48-fuer-Nikon-Super-high-precision.jpg)
William Optics
Camera adaptor Adapter M48 für Nikon Super high precision
$ 144.00
![Skywatcher Adaptor Canon, M48x0.75](/Produktbilder/normal/44350_1/Skywatcher-Adaptor-Canon-M48x0-75.jpg)
Skywatcher
Adaptor Canon, M48x0.75
RRP:
$ 34.90
Our price:
$ 29.90
![TS Optics Camera adaptor T2-Ring, Pentax K](/Produktbilder/normal/2420_1/TS-Optics-Camera-adaptor-T2-Ring-Pentax-K.jpg)
TS Optics
Camera adaptor T2-Ring, Pentax K
$ 27.90
![TS Optics Camera adaptor M48 compatible with Canon EOS R/RP](/Produktbilder/normal/70031_1/TS-Optics-Camera-adaptor-M48-compatible-with-Canon-EOS-R-RP.jpg)
TS Optics
Camera adaptor M48 compatible with Canon EOS R/RP
$ 41.90
![Baader Camera adaptor C-Mount/Nikon](/Produktbilder/normal/15424_1/Baader-Camera-adaptor-C-Mount-Nikon.jpg)
Baader
Camera adaptor C-Mount/Nikon
$ 82.00
![Bresser Camera adaptor T2-Ring, Minolta AF and Sony](/Produktbilder/normal/2418_1/Bresser-Camera-adaptor-T2-Ring-Minolta-AF-and-Sony.jpg)
Bresser
Camera adaptor T2-Ring, Minolta AF and Sony
$ 26.90
![Artesky Camera adaptor T2 ring Canon EOS](/Produktbilder/normal/68359_1/Artesky-Camera-adaptor-T2-ring-Canon-EOS.jpg)
Artesky
Camera adaptor T2 ring Canon EOS
$ 17.90
![Artesky Camera adaptor T2-connection Nikon AF/MF](/Produktbilder/normal/68360_1/Artesky-Camera-adaptor-T2-connection-Nikon-AF-MF.jpg)
Artesky
Camera adaptor T2-connection Nikon AF/MF
$ 17.90
![TeleVue Camera adaptor Nikon F-Mount](/Produktbilder/normal/71055_1/TeleVue-Camera-adaptor-Nikon-F-Mount.jpg)
TeleVue
Camera adaptor Nikon F-Mount
$ 111.00
![Bresser Camera adaptor M48 compatible with Canon EOS R/RP](/Produktbilder/normal/69681_1/Bresser-Camera-adaptor-M48-compatible-with-Canon-EOS-R-RP.jpg)
Bresser
Camera adaptor M48 compatible with Canon EOS R/RP
$ 27.90
![Bresser Camera adaptor T2 ring compatible with Canon EOS R/RP Wide-T](/Produktbilder/normal/69681_1/Bresser-Camera-adaptor-T2-ring-compatible-with-Canon-EOS-R-RP-Wide-T.jpg)
Bresser
Camera adaptor T2 ring compatible with Canon EOS R/RP Wide-T
$ 27.90
![Baader Camera adaptor Canon EOS DSL blank ring T-2/M48](/Produktbilder/normal/10708_1/Baader-Camera-adaptor-Canon-EOS-DSL-blank-ring-T-2-M48.jpg)