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 Mounting Kit for ZWO EAF Motorfocus on UNCN2-G2 and TSRPN2 focusers](/Produktbilder/normal/77396_1/Astroprints-Mounting-Kit-for-ZWO-EAF-Motorfocus-on-UNCN2-G2-and-TSRPN2-focusers.jpg)
Astroprints
Mounting Kit for ZWO EAF Motorfocus on UNCN2-G2 and TSRPN2 focusers
$ 95.00
![PrimaLuceLab ESATTO 4" Takahashi FSQ-106EDX](/Produktbilder/normal/75385_1/PrimaLuceLab-ESATTO-4-Takahashi-FSQ-106EDX.jpg)
PrimaLuceLab
ESATTO 4" Takahashi FSQ-106EDX
$ 184.00
![PrimaLuceLab Adapter ESATTO 2" LP auf SC](/Produktbilder/normal/79160_1/PrimaLuceLab-Adapter-ESATTO-2-LP-auf-SC.jpg)
PrimaLuceLab
Adapter ESATTO 2" LP auf SC
$ 106.00
![TS Optics Adapter Skywatcher ED-Apo](/Produktbilder/normal/77067_1/TS-Optics-Adapter-Skywatcher-ED-Apo.jpg)
TS Optics
Adapter Skywatcher ED-Apo
$ 99.00
![PegasusAstro Prodigy Adapter GSO RC 8"](/Produktbilder/normal/73440_1/PegasusAstro-Prodigy-Adapter-GSO-RC-8-.jpg)
PegasusAstro
Prodigy Adapter GSO RC 8"
$ 133.00
![TS Optics Adapter GSO, TS Photon](/Produktbilder/normal/77069_1/TS-Optics-Adapter-GSO-TS-Photon.jpg)
TS Optics
Adapter GSO, TS Photon
$ 49.90
![TS Optics Adapter M90](/Produktbilder/normal/77070_1/TS-Optics-Adapter-M90.jpg)
TS Optics
Adapter M90
$ 56.00
![Starlight Instruments Adapter VMC200L/VC200L 2.5"](/Produktbilder/normal/74089_1/Starlight-Instruments-Adapter-VMC200L-VC200L-2-5-.jpg)
Starlight Instruments
Adapter VMC200L/VC200L 2.5"
RRP:
$ 466.00
Our price:
$ 340.00
![Artesky Adapter Skywatcher für 2" UltraLight V3 OAZ](/Produktbilder/normal/77671_2/Artesky-Adapter-Skywatcher-fuer-2-UltraLight-V3-OAZ.jpg)
Artesky
Adapter Skywatcher für 2" UltraLight V3 OAZ
$ 42.90
![Artesky RC-Adapter UltraLight V3 M90x1](/Produktbilder/normal/74230_1/Artesky-RC-Adapter-UltraLight-V3-M90x1.jpg)
Artesky
RC-Adapter UltraLight V3 M90x1
$ 42.90
![TS Optics Adapter SC](/Produktbilder/normal/77065_1/TS-Optics-Adapter-SC.jpg)
TS Optics
Adapter SC
$ 62.00
![TS Optics Adapter M117](/Produktbilder/normal/77066_1/TS-Optics-Adapter-M117.jpg)
TS Optics
Adapter M117
$ 67.00
![TS Optics Adapter Skywatcher Newton](/Produktbilder/normal/77068_1/TS-Optics-Adapter-Skywatcher-Newton.jpg)
TS Optics
Adapter Skywatcher Newton
$ 53.00
![PrimaLuceLab Adapter ESATTO 2" - ARCO 2"](/Produktbilder/normal/79503_1/PrimaLuceLab-Adapter-ESATTO-2-ARCO-2-.jpg)
PrimaLuceLab
Adapter ESATTO 2" - ARCO 2"
$ 106.00
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PrimaLuceLab
Visual Back ESATTO 2"/ARCO 2"
$ 95.00
![Astroprints EAF Motoranbaukit mit Schelle, Schiene und Sucherschuh für Canon EF 200/F2.8L](/Produktbilder/normal/81904_1/Astroprints-EAF-Motoranbaukit-mit-Schelle-Schiene-und-Sucherschuh-fuer-Canon-EF-200-F2-8L.jpg)
Astroprints
EAF Motoranbaukit mit Schelle, Schiene und Sucherschuh für Canon EF 200/F2.8L
$ 200.00
![Astroprints EAF Motoranbaukit mit Schelle, Schiene und Sucherschuh für Sigma Art 105mm Objektiv](/Produktbilder/normal/78138_1/Astroprints-EAF-Motoranbaukit-mit-Schelle-Schiene-und-Sucherschuh-fuer-Sigma-Art-105mm-Objektiv.jpg)
Astroprints
EAF Motoranbaukit mit Schelle, Schiene und Sucherschuh für Sigma Art 105mm Objektiv
$ 200.00
Sale price:
$ 176.82
![Tecnosky Retrofit 2" GSO Monorail](/Produktbilder/normal/78219_1/Tecnosky-Retrofit-2-GSO-Monorail.jpg)
Tecnosky
Retrofit 2" GSO Monorail
$ 73.00
![Astroprints EAF Motoranbaukit mit Schelle, Schiene und Sucherschuh für Samyang 135 mm Objektiv](/Produktbilder/normal/78136_1/Astroprints-EAF-Motoranbaukit-mit-Schelle-Schiene-und-Sucherschuh-fuer-Samyang-135-mm-Objektiv.jpg)
Astroprints
EAF Motoranbaukit mit Schelle, Schiene und Sucherschuh für Samyang 135 mm Objektiv
$ 200.00
![Astroprints EAF Motoranbaukit mit Schelle, Schiene und Sucherschuh für Sigma Art 85mm Objektiv](/Produktbilder/normal/78137_1/Astroprints-EAF-Motoranbaukit-mit-Schelle-Schiene-und-Sucherschuh-fuer-Sigma-Art-85mm-Objektiv.jpg)
Astroprints
EAF Motoranbaukit mit Schelle, Schiene und Sucherschuh für Sigma Art 85mm Objektiv
$ 223.00
![PrimaLuceLab Adapter Esatto 3" auf Arco 2"](/Produktbilder/normal/81952_1/PrimaLuceLab-Adapter-Esatto-3-auf-Arco-2-.jpg)
PrimaLuceLab
Adapter Esatto 3" auf Arco 2"
$ 77.00
![TS Optics Basis für Newton-Okularauszüge für Tuben ab 190mm](/Produktbilder/normal/53297_1/TS-Optics-Basis-fuer-Newton-Okularauszuege-fuer-Tuben-ab-190mm.jpg)
TS Optics
Basis für Newton-Okularauszüge für Tuben ab 190mm
$ 35.90
![Starlight Instruments Okularadapter FTF32xx TRUE 3,0"/2,0"](/Produktbilder/normal/75395_1/Starlight-Instruments-Okularadapter-FTF32xx-TRUE-3-0-2-0-.jpg)
Starlight Instruments
Okularadapter FTF32xx TRUE 3,0"/2,0"
$ 274.00
![TS Optics Newtonian Base for Starlight FTF TRUE 3" focuser](/Produktbilder/normal/75393_1/TS-Optics-Newtonian-Base-for-Starlight-FTF-TRUE-3-focuser.jpg)
TS Optics
Newtonian Base for Starlight FTF TRUE 3" focuser
$ 166.00
![Starlight Instruments Adapter 3" William Optics GT102](/Produktbilder/normal/74105_1/Starlight-Instruments-Adapter-3-William-Optics-GT102.jpg)
Starlight Instruments
Adapter 3" William Optics GT102
RRP:
$ 560.00
Our price:
$ 412.00
![Starlight Instruments Adapter 3" Female to William Optics Male](/Produktbilder/normal/74104_1/Starlight-Instruments-Adapter-3-Female-to-William-Optics-Male.jpg)
Starlight Instruments
Adapter 3" Female to William Optics Male
RRP:
$ 277.00
Our price:
$ 197.00
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Starlight Instruments
Adapter 3" für Takahashi FS128
$ 333.00
![Starlight Instruments Adapter Takahashi FSQ85](/Produktbilder/normal/73997_1/Starlight-Instruments-Adapter-Takahashi-FSQ85.jpg)
Starlight Instruments
Adapter Takahashi FSQ85
RRP:
$ 378.00
Our price:
$ 276.00
![Starlight Instruments End Cap 3" für Takahasi M72x1](/Produktbilder/normal/78353_1/Starlight-Instruments-End-Cap-3-fuer-Takahasi-M72x1.jpg)
Starlight Instruments
End Cap 3" für Takahasi M72x1
$ 211.00
![Starlight Instruments WO FLT Adapter 3,5"](/Produktbilder/normal/73954_1/Starlight-Instruments-WO-FLT-Adapter-3-5-.jpg)
Starlight Instruments
WO FLT Adapter 3,5"
RRP:
$ 433.00
Our price:
$ 320.00
![Starlight Instruments FTF2015 adapter for small Meade thread](/Produktbilder/normal/13039_2/Starlight-Instruments-FTF2015-adapter-for-small-Meade-thread.jpg)
Starlight Instruments
FTF2015 adapter for small Meade thread
RRP:
$ 266.00
Our price:
$ 223.00
![PegasusAstro Conversion Kit (Universal) for FocusCube & MotorFocus](/Produktbilder/normal/65741_1/PegasusAstro-Conversion-Kit-Universal-for-FocusCube-MotorFocus.jpg)
PegasusAstro
Conversion Kit (Universal) for FocusCube & MotorFocus
$ 42.90
![Baader Adapter Diamond Steeltrack an Synta und Celetron ID 97mm](/Produktbilder/normal/58361_1/Baader-Adapter-Diamond-Steeltrack-an-Synta-und-Celetron-ID-97mm.jpg)
Baader
Adapter Diamond Steeltrack an Synta und Celetron ID 97mm
$ 47.90
![PegasusAstro Conversion Kit (SCT) for FocusCube & MotorFocus](/Produktbilder/normal/65742_1/PegasusAstro-Conversion-Kit-SCT-for-FocusCube-MotorFocus.jpg)
PegasusAstro
Conversion Kit (SCT) for FocusCube & MotorFocus
$ 87.00
![TS Optics Adapter für Skywatcher-Newton 2"](/Produktbilder/normal/62598_1/TS-Optics-Adapter-fuer-Skywatcher-Newton-2-.jpg)
TS Optics
Adapter für Skywatcher-Newton 2"
$ 64.00
![PrimaLuceLab ESATTO 4" Takahashi FSQ-106](/Produktbilder/normal/69956_1/PrimaLuceLab-ESATTO-4-Takahashi-FSQ-106.jpg)