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.
![William Optics SCT connection for WO Diagonals](/Produktbilder/normal/65327_2/William-Optics-SCT-connection-for-WO-Diagonals.jpg)
William Optics
SCT connection for WO Diagonals
$ 66.00
![ASToptics 1.25" eyepiece to 0.965 focuser adapter](/Produktbilder/normal/57678_1/ASToptics-1-25-eyepiece-to-0-965-focuser-adapter.jpg)
ASToptics
1.25" eyepiece to 0.965 focuser adapter
$ 38.90
![OPT Radian Raptor 61 Visual Back](/Produktbilder/normal/70687_1/OPT-Radian-Raptor-61-Visual-Back.jpg)
OPT
Radian Raptor 61 Visual Back
$ 111.00
![DayStar Eyepiece Holder for Quark 2"](/Produktbilder/normal/53980_1/DayStar-Eyepiece-Holder-for-Quark-2-.jpg)
DayStar
Eyepiece Holder for Quark 2"
$ 111.00
![Starlight Instruments Takahashi FS128 tube adapter ring](/Produktbilder/normal/20552_1/Starlight-Instruments-Takahashi-FS128-tube-adapter-ring.jpg)
Starlight Instruments
Takahashi FS128 tube adapter ring
RRP:
$ 630.00
Our price:
$ 465.00
![TS Optics Adapter 48mm auf M54](/Produktbilder/normal/66882_1/TS-Optics-Adapter-48mm-auf-M54.jpg)
TS Optics
Adapter 48mm auf M54
$ 5.90
![TS Optics Adapter 2"/SC](/Produktbilder/normal/68834_1/TS-Optics-Adapter-2-SC.jpg)
TS Optics
Adapter 2"/SC
$ 33.90
![Geoptik Adapter 50,8mm/M58](/Produktbilder/normal/65758_1/Geoptik-Adapter-50-8mm-M58.jpg)
Geoptik
Adapter 50,8mm/M58
$ 33.90
![TS Optics Adaptor for 1,25" eyepieces to 24,5mm / 0.965" focuser](/Produktbilder/normal/48767_1/TS-Optics-Adaptor-for-1-25-eyepieces-to-24-5mm-0-965-focuser.jpg)
TS Optics
Adaptor for 1,25" eyepieces to 24,5mm / 0.965" focuser
$ 27.90
![TS Optics M63/M68 adapter](/Produktbilder/normal/51288_1/TS-Optics-M63-M68-adapter.jpg)
TS Optics
M63/M68 adapter
$ 49.90
![Geoptik Maksutov / SC Adapter](/Produktbilder/normal/58417_1/Geoptik-Maksutov-SC-Adapter.jpg)
Geoptik
Maksutov / SC Adapter
$ 38.90
![TS Optics T2/SC adapter](/Produktbilder/normal/57008_1/TS-Optics-T2-SC-adapter.jpg)
TS Optics
T2/SC adapter
$ 22.90
![TS Optics Adapter T2/M48](/Produktbilder/normal/71182_1/TS-Optics-Adapter-T2-M48.jpg)
TS Optics
Adapter T2/M48
$ 27.90
![Baader Eyepiece clamp ClickLock 1 ¼"/T-2i](/Produktbilder/normal/10586_1/Baader-Eyepiece-clamp-ClickLock-1-f-T-2i.jpg)
Baader
Eyepiece clamp ClickLock 1 ¼"/T-2i
$ 97.00
![Baader Adapter M68/S52 für Wide-T-Ringe](/Produktbilder/normal/64625_1/Baader-Adapter-M68-S52-fuer-Wide-T-Ringe.jpg)
Baader
Adapter M68/S52 für Wide-T-Ringe
$ 52.00
![Askar Adapter T2/M48](/Produktbilder/normal/77140_1/Askar-Adapter-T2-M48.jpg)
Askar
Adapter T2/M48
$ 56.00
![Baader 2" M42 (T2) ClickLock clamp](/Produktbilder/normal/53093_1/Baader-2-M42-T2-ClickLock-clamp.jpg)
Baader
2" M42 (T2) ClickLock clamp
$ 112.00
![Baader 2" S52 ClickLock clamp](/Produktbilder/normal/53096_1/Baader-2-S52-ClickLock-clamp.jpg)
Baader
2" S52 ClickLock clamp
$ 92.00
![Baader 2"/S52 extension tube](/Produktbilder/normal/53092_1/Baader-2-S52-extension-tube.jpg)
Baader
2"/S52 extension tube
$ 45.90
![TS Optics M78/M82 adapter](/Produktbilder/normal/50217_1/TS-Optics-M78-M82-adapter.jpg)
TS Optics
M78/M82 adapter
$ 122.00
![TS Optics M28i to T2i adapter](/Produktbilder/normal/48946_1/TS-Optics-M28i-to-T2i-adapter.jpg)
TS Optics
M28i to T2i adapter
$ 25.90
![Baader T2/1.25" ultrashort adapter](/Produktbilder/normal/54441_1/Baader-T2-1-25-ultrashort-adapter.jpg)
Baader
T2/1.25" ultrashort adapter
$ 34.90
![TS Optics T2 to M48 adapter](/Produktbilder/normal/48889_1/TS-Optics-T2-to-M48-adapter.jpg)
TS Optics
T2 to M48 adapter
$ 21.90
![TeleVue SCT Adapter long](/Produktbilder/normal/19087_1/TeleVue-SCT-Adapter-long.jpg)
TeleVue
SCT Adapter long
$ 111.00
![Starlight Instruments 1.25'' to 2'' easy grip focuser adapter with 48mm thread](/Produktbilder/normal/13071_1/Starlight-Instruments-1-25-to-2-easy-grip-focuser-adapter-with-48mm-thread.jpg)
Starlight Instruments
1.25'' to 2'' easy grip focuser adapter with 48mm thread
RRP:
$ 200.00
Our price:
$ 137.00
![Starlight Instruments 1.25'' to 2'' low profile focuser adapter with 48mm thread](/Produktbilder/normal/13072_1/Starlight-Instruments-1-25-to-2-low-profile-focuser-adapter-with-48mm-thread.jpg)
Starlight Instruments
1.25'' to 2'' low profile focuser adapter with 48mm thread
RRP:
$ 211.00
Our price:
$ 147.00
![Starlight Instruments 95mm x 1mm thread, standard](/img5b29d2a57/products/product_placeholder_300x300.png)
Starlight Instruments
95mm x 1mm thread, standard
RRP:
$ 422.00
Our price:
$ 311.00
![Starlight Instruments 2.5" - 95x1mm male thread adapter, 0.9" L (this is our FTF25 series teflon-coupled collar)](/Produktbilder/normal/20536_1/Starlight-Instruments-2-5-95x1mm-male-thread-adapter-0-9-L-this-is-our-FTF25-series-teflon-coupled-collar-.jpg)
Starlight Instruments
2.5" - 95x1mm male thread adapter, 0.9" L (this is our FTF25 series teflon-coupled collar)
RRP:
$ 422.00
Our price:
$ 274.00
![Starlight Instruments 3.0" - 109x1mm adapter, male thread, 2.6" L (for our FTF30 series teflon-coupled collar)](/Produktbilder/normal/20538_1/Starlight-Instruments-3-0-109x1mm-adapter-male-thread-2-6-L-for-our-FTF30-series-teflon-coupled-collar-.jpg)
Starlight Instruments
3.0" - 109x1mm adapter, male thread, 2.6" L (for our FTF30 series teflon-coupled collar)
RRP:
$ 411.00
Our price:
$ 274.00
![Starlight Instruments 3.0" tube adapter - specifically designed to fit our FTF3035B to your Takahashi FS102 or TSA102 telescope](/Produktbilder/normal/20544_1/Starlight-Instruments-3-0-tube-adapter-specifically-designed-to-fit-our-FTF3035B-to-your-Takahashi-FS102-or-TSA102-telescope.jpg)
Starlight Instruments
3.0" tube adapter - specifically designed to fit our FTF3035B to your Takahashi FS102 or TSA102 telescope
RRP:
$ 640.00
Our price:
$ 474.00
![Starlight Instruments 3.0" - 115-1.25mm female thread adapter, 2.586" L (fits William Optics FLT 110 telescopes)](/Produktbilder/normal/20545_1/Starlight-Instruments-3-0-115-1-25mm-female-thread-adapter-2-586-L-fits-William-Optics-FLT-110-telescopes-.jpg)
Starlight Instruments
3.0" - 115-1.25mm female thread adapter, 2.586" L (fits William Optics FLT 110 telescopes)
RRP:
$ 640.00
Our price:
$ 474.00
![Starlight Instruments 3.0" - 3.29x16tpi female thread tube adapter, 2.335" L (fits Celestron C11 and C14 telescopes)](/Produktbilder/normal/20546_1/Starlight-Instruments-3-0-3-29x16tpi-female-thread-tube-adapter-2-335-L-fits-Celestron-C11-and-C14-telescopes-.jpg)
Starlight Instruments
3.0" - 3.29x16tpi female thread tube adapter, 2.335" L (fits Celestron C11 and C14 telescopes)
RRP:
$ 640.00
Our price:
$ 429.00
![Starlight Instruments 3.0" - 83.0mm male thread tube adapter (fits Meade 14)](/Produktbilder/normal/20547_1/Starlight-Instruments-3-0-83-0mm-male-thread-tube-adapter-fits-Meade-14-.jpg)
Starlight Instruments
3.0" - 83.0mm male thread tube adapter (fits Meade 14)
RRP:
$ 640.00
Our price:
$ 429.00
![Starlight Instruments 2.0" adapter (Vixen longer)](/Produktbilder/normal/20528_1/Starlight-Instruments-2-0-adapter-Vixen-longer-.jpg)
Starlight Instruments
2.0" adapter (Vixen longer)
RRP:
$ 344.00
Our price:
$ 223.00
![Starlight Instruments 3.5" - 75x1mm male to 2.156x24tpi male thread adapter, 0.125" L (converts 'AP threaded end cap' to 'SBIG STL 1100' threads)](/Produktbilder/normal/20554_1/Starlight-Instruments-3-5-75x1mm-male-to-2-156x24tpi-male-thread-adapter-0-125-L-converts-AP-threaded-end-cap-to-SBIG-STL-1100-threads-.jpg)
Starlight Instruments
3.5" - 75x1mm male to 2.156x24tpi male thread adapter, 0.125" L (converts 'AP threaded end cap' to 'SBIG STL 1100' threads)
RRP:
$ 266.00
Our price:
$ 188.00
![Starlight Instruments "Takahashi TOA 150" 3.5" tube adapter ring](/Produktbilder/normal/20553_1/Starlight-Instruments-Takahashi-TOA-150-3-5-tube-adapter-ring.jpg)