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.
![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
![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
![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
![Omegon T2-Adapter für Canon EOS - ohne Fotogewinde](/Produktbilder/normal/43762_1/Omegon-T2-Adapter-fuer-Canon-EOS-ohne-Fotogewinde.jpg)
Omegon
T2-Adapter für Canon EOS - ohne Fotogewinde
RRP:
$ 99.00
Our price:
$ 79.00
![Omegon T2 adapter for Canon EOS lenses](/Produktbilder/normal/43762_1/Omegon-T2-adapter-for-Canon-EOS-lenses.jpg)
Omegon
T2 adapter for Canon EOS lenses
$ 99.00
![ASToptics Canon lens to 1.25"/T2 adapter](/Produktbilder/normal/57835_1/ASToptics-Canon-lens-to-1-25-T2-adapter.jpg)
ASToptics
Canon lens to 1.25"/T2 adapter
$ 111.00
![TS Optics M48-Adapter für Canon EOS Objektive](/Produktbilder/normal/72166_1/TS-Optics-M48-Adapter-fuer-Canon-EOS-Objektive.jpg)
TS Optics
M48-Adapter für Canon EOS Objektive
$ 55.00
![TS Optics M54-Adapter für Canon EOS Objektive](/Produktbilder/normal/84330_1/TS-Optics-M54-Adapter-fuer-Canon-EOS-Objektive.jpg)
TS Optics
M54-Adapter für Canon EOS Objektive
$ 100.00
![Artesky Adapter Canon to CMOS with Filter Drawer](/Produktbilder/normal/56975_1/Artesky-Adapter-Canon-to-CMOS-with-Filter-Drawer.jpg)
Artesky
Adapter Canon to CMOS with Filter Drawer
$ 188.00
![TS Optics Adapter for EF lenses on Canon EOS R cameras with filter holder 50mm](/Produktbilder/normal/69891_1/TS-Optics-Adapter-for-EF-lenses-on-Canon-EOS-R-cameras-with-filter-holder-50mm.jpg)
TS Optics
Adapter for EF lenses on Canon EOS R cameras with filter holder 50mm
$ 156.00
![Artesky M54-Adapter für Canon EOS Objektive](/Produktbilder/normal/69131_1/Artesky-M54-Adapter-fuer-Canon-EOS-Objektive.jpg)
Artesky
M54-Adapter für Canon EOS Objektive
$ 144.00
![Artesky M48-Adapter für Canon EOS Objektive](/Produktbilder/normal/69130_1/Artesky-M48-Adapter-fuer-Canon-EOS-Objektive.jpg)
Artesky
M48-Adapter für Canon EOS Objektive
$ 124.00
![Artesky T2 adapter for Canon EOS lenses](/Produktbilder/normal/69123_1/Artesky-T2-adapter-for-Canon-EOS-lenses.jpg)
Artesky
T2 adapter for Canon EOS lenses
$ 124.00
![Geoptik T2 adapter for Canon EOS lenses](/Produktbilder/normal/18704_1/Geoptik-T2-adapter-for-Canon-EOS-lenses.jpg)
Geoptik
T2 adapter for Canon EOS lenses
$ 155.00
![ZWO Canon EOS adapter for ASI cameras](/Produktbilder/normal/66019_1/ZWO-Canon-EOS-adapter-for-ASI-cameras.jpg)