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.
![Astroprints Halterung für ZWO ASIAIR Plus und Mini an Vixen-Schienen](/Produktbilder/normal/78157_1/Astroprints-Halterung-fuer-ZWO-ASIAIR-Plus-und-Mini-an-Vixen-Schienen.jpg)
Astroprints
Halterung für ZWO ASIAIR Plus und Mini an Vixen-Schienen
$ 33.90
![PegasusAstro Saddle Powerbox-Adapterplatte für EQ6-R / NEQ-6](/Produktbilder/normal/79166_1/PegasusAstro-Saddle-Powerbox-Adapterplatte-fuer-EQ6-R-NEQ-6.jpg)
PegasusAstro
Saddle Powerbox-Adapterplatte für EQ6-R / NEQ-6
$ 52.00
![PegasusAstro Saddle Powerbox-Adapterplatte für AM5](/Produktbilder/normal/79166_1/PegasusAstro-Saddle-Powerbox-Adapterplatte-fuer-AM5.jpg)
PegasusAstro
Saddle Powerbox-Adapterplatte für AM5
$ 52.00
![Rainbow Astro AP Mach1 Adapter](/Produktbilder/normal/73600_1/Rainbow-Astro-AP-Mach1-Adapter.jpg)
Rainbow Astro
AP Mach1 Adapter
$ 367.00
![PegasusAstro Saddle Powerbox-Adapterplatte für RST135/RST300](/Produktbilder/normal/79166_1/PegasusAstro-Saddle-Powerbox-Adapterplatte-fuer-RST135-RST300.jpg)
PegasusAstro
Saddle Powerbox-Adapterplatte für RST135/RST300
$ 52.00
![iOptron SkyGuider Pro Kit](/Produktbilder/normal/69659_1/iOptron-SkyGuider-Pro-Kit.jpg)
iOptron
SkyGuider Pro Kit
$ 200.00
![iOptron Tri-Pier adapter for Paramount MyT mount](/Produktbilder/normal/52983_1/iOptron-Tri-Pier-adapter-for-Paramount-MyT-mount.jpg)
iOptron
Tri-Pier adapter for Paramount MyT mount
$ 133.00
![ADM Prismenschienen-Adapter für TeleVue Montierungen](/Produktbilder/normal/65830_1/ADM-Prismenschienen-Adapter-fuer-TeleVue-Montierungen.jpg)
ADM
Prismenschienen-Adapter für TeleVue Montierungen
$ 132.00
![iOptron Tri-Pier adapter for Skywatcher, Celestron and Orion](/Produktbilder/normal/52982_1/iOptron-Tri-Pier-adapter-for-Skywatcher-Celestron-and-Orion.jpg)
iOptron
Tri-Pier adapter for Skywatcher, Celestron and Orion
RRP:
$ 166.00
Our price:
$ 150.00
![iOptron Tri-Pier adapter for ZEQ25 and CEM25 mounts](/Produktbilder/normal/52985_1/iOptron-Tri-Pier-adapter-for-ZEQ25-and-CEM25-mounts.jpg)
iOptron
Tri-Pier adapter for ZEQ25 and CEM25 mounts
RRP:
$ 222.00
Our price:
$ 206.00
![TS Optics Prismenschienenadapter Vixen auf Losmandy](/Produktbilder/normal/58294_1/TS-Optics-Prismenschienenadapter-Vixen-auf-Losmandy.jpg)
TS Optics
Prismenschienenadapter Vixen auf Losmandy
$ 77.00
![iOptron Tri-Pier Adapter for Astro-Physics mount](/Produktbilder/normal/52984_1/iOptron-Tri-Pier-Adapter-for-Astro-Physics-mount.jpg)
iOptron
Tri-Pier Adapter for Astro-Physics mount
$ 333.00
![Lunatico Mounting saddle for 18mm DuoScope Swivel counterweight rod](/Produktbilder/normal/54722_1/Lunatico-Mounting-saddle-for-18mm-DuoScope-Swivel-counterweight-rod.jpg)
Lunatico
Mounting saddle for 18mm DuoScope Swivel counterweight rod
$ 245.00
![Lunatico DuoScope Swivel 20mm](/Produktbilder/normal/54722_1/Lunatico-DuoScope-Swivel-20mm.jpg)
Lunatico
DuoScope Swivel 20mm
$ 245.00
![Geoptik Tripod adapter for HEQ5 mount](/Produktbilder/normal/44470_1/Geoptik-Tripod-adapter-for-HEQ5-mount.jpg)
Geoptik
Tripod adapter for HEQ5 mount
$ 122.00
![Vixen Mounting plate fork mounting](/Produktbilder/normal/5885_1/Vixen-Mounting-plate-fork-mounting.jpg)
Vixen
Mounting plate fork mounting
$ 184.00
![Vixen Polarie Quick Release Angle Plate](/Produktbilder/normal/55289_1/Vixen-Polarie-Quick-Release-Angle-Plate.jpg)
Vixen
Polarie Quick Release Angle Plate
$ 106.00
![Geoptik Prism clamp to Celestron AVX mount adapter](/Produktbilder/normal/57015_1/Geoptik-Prism-clamp-to-Celestron-AVX-mount-adapter.jpg)
Geoptik
Prism clamp to Celestron AVX mount adapter
$ 144.00
![10 Micron Adapter to mount 3" Clamps onto GM4000](/Produktbilder/normal/49387_1/10-Micron-Adapter-to-mount-3-Clamps-onto-GM4000.jpg)
10 Micron
Adapter to mount 3" Clamps onto GM4000
$ 307.00
![10 Micron Pier and tripod flange for GM1000](/Produktbilder/normal/25294_1/10-Micron-Pier-and-tripod-flange-for-GM1000.jpg)
10 Micron
Pier and tripod flange for GM1000
$ 95.00
![10 Micron Adapter to mount 3" Clamps onto GM3000](/Produktbilder/normal/49385_1/10-Micron-Adapter-to-mount-3-Clamps-onto-GM3000.jpg)
10 Micron
Adapter to mount 3" Clamps onto GM3000
$ 303.00
![Geoptik Adapter for connecting the saddle plate to EQ6 mount](/Produktbilder/normal/48990_1/Geoptik-Adapter-for-connecting-the-saddle-plate-to-EQ6-mount.jpg)
Geoptik
Adapter for connecting the saddle plate to EQ6 mount
$ 66.00
![Geoptik Adapter for connecting to prism clamp on HEQ-5](/Produktbilder/normal/46693_1/Geoptik-Adapter-for-connecting-to-prism-clamp-on-HEQ-5.jpg)
Geoptik
Adapter for connecting to prism clamp on HEQ-5
$ 66.00
![Losmandy FHD / Meade field tripod adapter](/Produktbilder/normal/51512_1/Losmandy-FHD-Meade-field-tripod-adapter.jpg)
Losmandy
FHD / Meade field tripod adapter
$ 530.00
![ADM Prismenschienen-Adapter für Celestron StarSense](/Produktbilder/normal/71124_1/ADM-Prismenschienen-Adapter-fuer-Celestron-StarSense.jpg)
ADM
Prismenschienen-Adapter für Celestron StarSense
$ 132.00
![Software Bisque Paramount ME Lightweight Wedge to Pier Adaptor Plate](/Produktbilder/normal/51039_1/Software-Bisque-Paramount-ME-Lightweight-Wedge-to-Pier-Adaptor-Plate.jpg)