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
![PrimaLuceLab C82 Adapter EQ5/HEQ5/AZ-EQ5](/Produktbilder/normal/74114_1/PrimaLuceLab-C82-Adapter-EQ5-HEQ5-AZ-EQ5.jpg)
PrimaLuceLab
C82 Adapter EQ5/HEQ5/AZ-EQ5
$ 262.00
![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
![Geoptik AM5 Adapter](/Produktbilder/normal/78809_1/Geoptik-AM5-Adapter.jpg)
Geoptik
AM5 Adapter
$ 156.00
![PrimaLuceLab C82 Adapter EQ6/AZ-EQ6](/Produktbilder/normal/79030_1/PrimaLuceLab-C82-Adapter-EQ6-AZ-EQ6.jpg)
PrimaLuceLab
C82 Adapter EQ6/AZ-EQ6
$ 262.00
![PrimaLuceLab Adapter EQ6/EQ6-R/AZ-EQ6 auf C120 Pier](/Produktbilder/normal/79557_1/PrimaLuceLab-Adapter-EQ6-EQ6-R-AZ-EQ6-auf-C120-Pier.jpg)
PrimaLuceLab
Adapter EQ6/EQ6-R/AZ-EQ6 auf C120 Pier
$ 440.00
![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
![Rainbow Astro AP Mach1 Adapter](/Produktbilder/normal/73600_1/Rainbow-Astro-AP-Mach1-Adapter.jpg)
Rainbow Astro
AP Mach1 Adapter
$ 367.00
![iOptron Counterweight CEM26 low latitude CW connection](/Produktbilder/normal/75644_1/iOptron-Counterweight-CEM26-low-latitude-CW-connection.jpg)
iOptron
Counterweight CEM26 low latitude CW connection
$ 111.00
![iOptron iPolar Adapter Celestron AVX](/Produktbilder/normal/69425_1/iOptron-iPolar-Adapter-Celestron-AVX.jpg)
iOptron
iPolar Adapter Celestron AVX
RRP:
$ 66.00
Our price:
$ 64.00
![Losmandy GM8/GM811 Adapter iPolar](/Produktbilder/normal/75508_1/Losmandy-GM8-GM811-Adapter-iPolar.jpg)
Losmandy
GM8/GM811 Adapter iPolar
$ 77.00
![Losmandy G11 Adapter iPolar](/Produktbilder/normal/76425_1/Losmandy-G11-Adapter-iPolar.jpg)
Losmandy
G11 Adapter iPolar
$ 73.00
![iOptron iPolar Adapter CEM25](/Produktbilder/normal/69425_1/iOptron-iPolar-Adapter-CEM25.jpg)
iOptron
iPolar Adapter CEM25
RRP:
$ 66.00
Our price:
$ 56.00
![ASToptics PHOTO ADAPTER FOR EQ3 / EQ5 TRIPOD](/Produktbilder/normal/57914_1/ASToptics-PHOTO-ADAPTER-FOR-EQ3-EQ5-TRIPOD.jpg)
ASToptics
PHOTO ADAPTER FOR EQ3 / EQ5 TRIPOD
$ 100.00
![iOptron iPolar Adapter HEQ-5](/Produktbilder/normal/69425_1/iOptron-iPolar-Adapter-HEQ-5.jpg)
iOptron
iPolar Adapter HEQ-5
RRP:
$ 66.00
Our price:
$ 56.00
![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 AZ Pro Bino Adapter](/Produktbilder/normal/73395_1/iOptron-AZ-Pro-Bino-Adapter.jpg)
iOptron
AZ Pro Bino Adapter
$ 530.00
![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
![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
![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
![PrimaLuceLab Adapter-Platte für EQ5](/Produktbilder/normal/72294_1/PrimaLuceLab-Adapter-Platte-fuer-EQ5.jpg)
PrimaLuceLab
Adapter-Platte für EQ5
$ 233.00
![Avalon iPolar Adapter Kit](/Produktbilder/normal/70614_1/Avalon-iPolar-Adapter-Kit.jpg)
Avalon
iPolar Adapter Kit
$ 155.00
![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 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
![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
![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)