Celestron Intermediate ring set M42 (T-2)
- Celestron M42 (T-2) extension tubes, set
- the set contains three extension tubes of different lengths (7.5 mm, 12 mm, 30 mm)
- for setting the optimal working distance of your camera on the telescope to achieve the best image quality
- for connecting your T-ring and T-adapter with standard male and female T-thread
M42 (T-2) extension rings, set
To achieve the best astro images, it is important to maintain the correct working distance between the camera and telescope. If the back focus required by your camera is not maintained exactly, the stars at the corners of the full-frame image sensors will appear stretched and not point-like.
Example: RASA 8 with a ZWO ASI 183 MC PRO camera:
Required backfocus distance for RASA 8 with supplied M42 (T-2) camera adapter: 25mm
Backfocus of the ZWO ASI 183 MC PRO: 17.5 mm
To achieve the correct working distance, a 7.5 mm M42 extension ring is required
Example: RASA 8 with an ATIK Horizon camera:
Required backfocus distance for RASA 8 with supplied M42 (T-2) camera adapter: 25mm
Backfocus of the ATIK Horizon: 13 mm
To achieve the correct working distance, a 12 mm M42 extension ring is required
The M42 extension ring set from Celestron contains three extension rings of different lengths to achieve the correct distances.
Use
Depending on whether you are photographing with a DSLR or a CCD/CMOS camera, there are two ways to use the M42 extension ring. If you are using a DSLR, screw the desired M42 extension ring between your T-ring and the T-adapter for your optical tube. If you are using a CCD or CMOS camera, screw the desired M42 extension ring between the camera and the T-adapter for the optical tube.
Below you will find an overview of which extension rings to use for our EdgeHD, Schmidt-Cassegrain and RASA 8 optical tubes:
Size of the extension ring:
7.5mm provides the correct distance with RASA 8 for many ZWO cameras
12mm provides the correct distance with RASA 8 for many Atik cameras
30mm brings ZWO cameras with filter sliders up to the 55mm back-focus standard for use with Schmidt-Cassegrain + EdgeHD
Body
The M42 extension rings are made of machined aluminum, anodized black. The inner surfaces are blackened and provided with a baffle thread for stray light suppression in order to achieve the highest contrast. Each extension ring has a knurled surface that provides a large gripping surface for screwing and unscrewing. The M42 extension rings are compatible with M42 x 0.75 (T-thread) camera adapters.
Celestron Intermediate ring set M42 (T-2)
Short profile
- Celestron M42 (T-2) extension tubes, set
- the set contains three extension tubes of different lengths (7.5 mm, 12 mm, 30 mm)
- for setting the optimal working distance of your camera on the telescope to achieve the best image quality
- for connecting your T-ring and T-adapter with standard male and female T-thread
Product description for Celestron Intermediate ring set M42 (T-2)
M42 (T-2) extension rings, set
To achieve the best astro images, it is important to maintain the correct working distance between the camera and telescope. If the back focus required by your camera is not maintained exactly, the stars at the corners of the full-frame image sensors will appear stretched and not point-like.
Example: RASA 8 with a ZWO ASI 183 MC PRO camera:
Required backfocus distance for RASA 8 with supplied M42 (T-2) camera adapter: 25mm
Backfocus of the ZWO ASI 183 MC PRO: 17.5 mm
To achieve the correct working distance, a 7.5 mm M42 extension ring is required
Example: RASA 8 with an ATIK Horizon camera:
Required backfocus distance for RASA 8 with supplied M42 (T-2) camera adapter: 25mm
Backfocus of the ATIK Horizon: 13 mm
To achieve the correct working distance, a 12 mm M42 extension ring is required
The M42 extension ring set from Celestron contains three extension rings of different lengths to achieve the correct distances.
Use
Depending on whether you are photographing with a DSLR or a CCD/CMOS camera, there are two ways to use the M42 extension ring. If you are using a DSLR, screw the desired M42 extension ring between your T-ring and the T-adapter for your optical tube. If you are using a CCD or CMOS camera, screw the desired M42 extension ring between the camera and the T-adapter for the optical tube.
Below you will find an overview of which extension rings to use for our EdgeHD, Schmidt-Cassegrain and RASA 8 optical tubes:
Size of the extension ring:
7.5mm provides the correct distance with RASA 8 for many ZWO cameras
12mm provides the correct distance with RASA 8 for many Atik cameras
30mm brings ZWO cameras with filter sliders up to the 55mm back-focus standard for use with Schmidt-Cassegrain + EdgeHD
Body
The M42 extension rings are made of machined aluminum, anodized black. The inner surfaces are blackened and provided with a baffle thread for stray light suppression in order to achieve the highest contrast. Each extension ring has a knurled surface that provides a large gripping surface for screwing and unscrewing. The M42 extension rings are compatible with M42 x 0.75 (T-thread) camera adapters.
Celestron Intermediate ring set M42 (T-2)
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