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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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Omegon 2“ Extension tube, 35mm optical path
Omegon
2“ Extension tube, 35mm optical path
$ 29.90
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Omegon 1.25'', 30mm extension tube
Omegon
1.25'', 30mm extension tube
$ 19.90
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Omegon 2'' extension tube with 50mm optical path
Omegon
2'' extension tube with 50mm optical path
$ 39.90
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Omegon 2'' - 1.25'' Twist-lock adapter
Omegon
2'' - 1.25'' Twist-lock adapter
( 5 / 5 )
$ 79.00
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Omegon T2 to 1.25'' adapter
Omegon
T2 to 1.25'' adapter
$ 29.90
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Omegon 2'' extension tube, 80mm optical path
Omegon
2'' extension tube, 80mm optical path
$ 49.90
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Omegon 2'' Twist-lock adapter
Omegon
2'' Twist-lock adapter
$ 99.00
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Explore Scientific Extension tube M48 set
Explore Scientific
Extension tube M48 set
$ 58.00
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Omegon Camera adaptor T2-Ring compatible with Canon EOS
Omegon
Camera adaptor T2-Ring compatible with Canon EOS
( 4 / 5 )
$ 19.90
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Omegon 40mm T2i/T2a T2 extension ring
Omegon
40mm T2i/T2a T2 extension ring
$ 24.90
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ASToptics M54 (Female) to M48 (Male) adapter
ASToptics
M54 (Female) to M48 (Male) adapter
$ 31.90
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Omegon T-Adapter M54(m)/T2(m)
Omegon
T-Adapter M54(m)/T2(m)
$ 24.90
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Omegon 7.5 mm T2i/T2a T2 extension ring
Omegon
7.5 mm T2i/T2a T2 extension ring
$ 19.90
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Omegon Extension tube Extender 30 mm T- thread
Omegon
Extension tube Extender 30 mm T- thread
$ 29.90
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Omegon 15mm T2i/T2a T2 extension ring
Omegon
15mm T2i/T2a T2 extension ring
$ 24.90
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Omegon Adaptors T-2 to 1.25 nosepiece
Omegon
Adaptors T-2 to 1.25 nosepiece
( 5 / 5 )
$ 19.90
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Baader ClickLock 2" to 1.25" reducer adapter
Baader
ClickLock 2" to 1.25" reducer adapter
( 5 / 5 )
$ 87.00
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ASToptics Extension tube M48 Fine tuning Kit - 0.5mm; 0.8mm; 1mm
ASToptics
Extension tube M48 Fine tuning Kit - 0.5mm; 0.8mm; 1mm
$ 25.90
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ASToptics T2 extension tube - 30mm
ASToptics
T2 extension tube - 30mm
$ 20.90
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Omegon 2" extension tube
Omegon
2" extension tube
$ 19.90
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Omegon Adaptors Adapter of 2'' on T2, optical path only 3 mm
Omegon
Adaptors Adapter of 2'' on T2, optical path only 3 mm
( 5 / 5 )
$ 34.90
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Omegon Syncfocus flip-mirror (for planetary cameras)
Omegon
Syncfocus flip-mirror (for planetary cameras)
( 2 / 5 )
$ 69.00
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Omegon T-thread Extension and 2'' nosepiece 21mm
Omegon
T-thread Extension and 2'' nosepiece 21mm
$ 19.90
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Omegon Camera adaptor T2-Ring für Nikon
Omegon
Camera adaptor T2-Ring für Nikon
$ 19.90
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Omegon T2 Cap (T cap female)
Omegon
T2 Cap (T cap female)
$ 19.90
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PegasusAstro Adapter M54 Male - M54 Male
PegasusAstro
Adapter M54 Male - M54 Male
$ 31.90
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Omegon Camera adapter 1.25"
Omegon
Camera adapter 1.25"
$ 24.90
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ZWO T2 / C mount adapter
ZWO
T2 / C mount adapter
$ 25.90
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Omegon Extension tube 45mm Extender 2''
Omegon
Extension tube 45mm Extender 2''
$ 29.90
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Omegon Adapter M82-M48
Omegon
Adapter M82-M48
RRP:  $ 69.00
Our price:
$ 44.90
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ASToptics M42 (FEMALE) TO M42 (FEMALE) adapter, 10MM
ASToptics
M42 (FEMALE) TO M42 (FEMALE) adapter, 10MM
$ 25.90
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ASToptics Extension tube T2 Fine tuning Kit - 0.5mm; 0.8mm; 1mm
ASToptics
Extension tube T2 Fine tuning Kit - 0.5mm; 0.8mm; 1mm
$ 25.90
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Baader Adapter 2" M54 ClickLock clamp
Baader
Adapter 2" M54 ClickLock clamp
$ 92.00
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ASToptics Extension Tube M48 Filter thread - 4mm Length
ASToptics
Extension Tube M48 Filter thread - 4mm Length
$ 20.90
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ASToptics Extension tube M48 - Filter thread - 5mm long
ASToptics
Extension tube M48 - Filter thread - 5mm long
$ 20.90
ready for shipping in 24 h
ASToptics T2 ADAPTER FOR TELEVUE POWERMATE 2.5X/5X
ASToptics
T2 ADAPTER FOR TELEVUE POWERMATE 2.5X/5X
$ 52.00
ready for shipping in 24 h