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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.

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iOptron Tri-Pier adapter for Skywatcher, Celestron and Orion
iOptron
Tri-Pier adapter for Skywatcher, Celestron and Orion
RRP:  $ 156.00
Our price:
$ 140.00
ready for shipping in 24 h
Astroprints Bracket for ZWO ASIAIR Plus and Mini on Vixen rails
Astroprints
Bracket for ZWO ASIAIR Plus and Mini on Vixen rails
$ 31.90
ready for shipping in 24 h
iOptron Tri-Pier Adapter for Astro-Physics mount
iOptron
Tri-Pier Adapter for Astro-Physics mount
$ 312.00
ready for shipping in 3-5 weeks
Losmandy FHD / Meade field tripod adapter
Losmandy
FHD / Meade field tripod adapter
$ 489.00
ready for shipping in 6-10 weeks
Software Bisque Paramount ME Lightweight Wedge to Pier Adaptor Plate
Software Bisque
Paramount ME Lightweight Wedge to Pier Adaptor Plate
$ 478.00
ready for shipping in 3-6 months
Rainbow Astro AP Mach1 Adapter
Rainbow Astro
AP Mach1 Adapter
$ 343.00
ready for shipping in 3-5 weeks
ADM Prism rail adaptors for Celestron StarSense
ADM
Prism rail adaptors for Celestron StarSense
$ 123.00
ready for shipping in 24 h
Vixen Mounting plate fork mounting
Vixen
Mounting plate fork mounting
$ 172.00
ready for shipping in 24 h
iOptron Tri-Pier adapter for ZEQ25 and CEM25 mounts
iOptron
Tri-Pier adapter for ZEQ25 and CEM25 mounts
RRP:  $ 208.00
Our price:
$ 193.00
ready for shipping in 3-5 weeks
iOptron SkyGuider Pro Kit
iOptron
SkyGuider Pro Kit
$ 187.00
ready for shipping in 3-5 weeks
iOptron Tri-Pier adapter for Paramount MyT mount
iOptron
Tri-Pier adapter for Paramount MyT mount
$ 124.00
ready for shipping in 3-5 weeks
Geoptik Adapter for connecting the saddle plate to EQ6 mount
Geoptik
Adapter for connecting the saddle plate to EQ6 mount
$ 62.00
ready for shipping in 3-5 weeks
PegasusAstro Saddle Powerbox adapter plate for EQ6-R / NEQ-6
PegasusAstro
Saddle Powerbox adapter plate for EQ6-R / NEQ-6
$ 47.90
ready for shipping in 24 h
PegasusAstro Saddle Powerbox adapter plate for AM5
PegasusAstro
Saddle Powerbox adapter plate for AM5
$ 47.90
ready for shipping in 24 h
PegasusAstro Saddle Powerbox adapter plate for RST135/RST300
PegasusAstro
Saddle Powerbox adapter plate for RST135/RST300
$ 47.90
ready for shipping in 1-2 weeks
Lunatico DuoScope Swivel 20mm
Lunatico
DuoScope Swivel 20mm
$ 230.00
ready for shipping in 3-5 weeks
Lunatico Mounting saddle for 18mm DuoScope Swivel counterweight rod
Lunatico
Mounting saddle for 18mm DuoScope Swivel counterweight rod
$ 230.00
ready for shipping in 3-5 weeks
Geoptik Tripod adapter for HEQ5 mount
Geoptik
Tripod adapter for HEQ5 mount
$ 114.00
ready for shipping in 3-5 weeks
10 Micron Adapter to mount 3" Clamps onto GM4000
10 Micron
Adapter to mount 3" Clamps onto GM4000
$ 287.00
ready for shipping in 1-2 weeks
10 Micron Adapter to mount 3" Clamps onto GM3000
10 Micron
Adapter to mount 3" Clamps onto GM3000
$ 284.00
ready for shipping in 1-2 weeks
Geoptik Prism clamp to Celestron AVX mount adapter
Geoptik
Prism clamp to Celestron AVX mount adapter
$ 135.00
ready for shipping in 3-5 weeks
TS Optics Vixen to Losmandy dovetail bar adapter
TS Optics
Vixen to Losmandy dovetail bar adapter
$ 72.00
ready for shipping in 3-7 days
ADM Prism rail adaptors for TeleVue mounts
ADM
Prism rail adaptors for TeleVue mounts
$ 123.00
ready for shipping in 3-5 weeks
Geoptik Adapter for connecting to prism clamp on HEQ-5
Geoptik
Adapter for connecting to prism clamp on HEQ-5
$ 62.00
ready for shipping in 3-5 weeks
10 Micron Pier and tripod flange for GM1000
10 Micron
Pier and tripod flange for GM1000
$ 89.00
ready for shipping in 1-2 weeks