BuckeyeStargazer Duncan Mask for SCT Collimation - For Meade Telescopes
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Duncan Mask for SCT Collimation - For Meade Telescopes
Important note:
Duncan masks are a collimation aid. These can be used in conjunction with collimation knobs sold by Bob's Knobs and others. Duncan masks can also be used for rough focusing but they are not effective tools for critical focus work. For that, you may want to look at Bahtinov or TriBahtinov masks instead.
Please note that this is a 3d printed plastic part.
A Duncan Mask can be used to easily and quickly collimate the secondary mirror of your SCT. Instructions are provided below.
BuckeyeStargazer's Duncan collimations masks comes in sections that "snap-fit" together and can be taken apart for easier storage. They are available for many different Meade SCT telescopes as listed below. Masks for Celestron SCTs are available separately.
Sizes:
- M8 (Hole dia. 77mm): For Meade 8" Model LX200/GPS/ACF/LX90/GPS/ACF/LS90ACF/2080
- M10 (Hole dia. 78mm): For Meade 10" 2120/LX3/LX50/LX90/LX90GPS/LX200 Classic/LX200GPS/2120 F10
- M10LXEMC (Hole dia. 87mm): For Meade 10" LX200 EMC
- M10LXF6.3 (Hole dia. 85mm):For Meade 10" LX200 F6.3
- M10LXACF (Hole dia. 89mm): For Meade 10" LX90ACF/LX200ACF
- M12LX200 (Hole dia. 89mm): For Meade 12" LX200/LX200GPS
- M12LX200ACF (Hole dia. 92mm): For Meade 12" LX200ACF
- M14LX200 (Hole dia. 130mm): For Meade 14" LX200/LX200GPS
- M14LXACF (Hole dia. 136mm): For Meade 14" LX200ACF
- M16LX200 (Hole dia. 115.5mm): For Meade 16" LX200/LX200GPS
Additional Notes:
- 14" and larger masks come in 6 sections, all others are 3 sections.
- 10" f/6.3, 14" and 16" masks listed above are available by special order. Please contact us if interested.
BuckeyeStargazer's items are made out of PETG plastic and can handle temperatures of up to 80°C (175°F).
Instructions for use:
1. Make sure your scope has cooled to ambient temperature.
2. Point the scope at a bright star that is high in elevation.
3. Place the mask on the scope. Orient the mask such that the three snap fit connection lines point to the 3 collimation screws on the Secondary as shown in the scope image above.
4. A camera works best, but you can also use a high magnification eyepiece. Grossly defocus the star. You should see three arcs that correspond to the three cutouts.
5. As you bring the star closer to focus the curves will change into lines pointing to a common center. 
6. Use the lines to adjust the collimation screw opposite the line. As you adjust the screw the line will move toward the center. The goal is to form a perfect Y where the lines touch in the center. 
Other Information
- Country of Manufacture: United States
Duncan Mask for SCT Collimation - For Meade Telescopes
Important note:
Duncan masks are a collimation aid. These can be used in conjunction with collimation knobs sold by Bob's Knobs and others. Duncan masks can also be used for rough focusing but they are not effective tools for critical focus work. For that, you may want to look at Bahtinov or TriBahtinov masks instead.
Please note that this is a 3d printed plastic part.
A Duncan Mask can be used to easily and quickly collimate the secondary mirror of your SCT. Instructions are provided below.
BuckeyeStargazer's Duncan collimations masks comes in sections that "snap-fit" together and can be taken apart for easier storage. They are available for many different Meade SCT telescopes as listed below. Masks for Celestron SCTs are available separately.
Sizes:
- M8 (Hole dia. 77mm): For Meade 8" Model LX200/GPS/ACF/LX90/GPS/ACF/LS90ACF/2080
- M10 (Hole dia. 78mm): For Meade 10" 2120/LX3/LX50/LX90/LX90GPS/LX200 Classic/LX200GPS/2120 F10
- M10LXEMC (Hole dia. 87mm): For Meade 10" LX200 EMC
- M10LXF6.3 (Hole dia. 85mm):For Meade 10" LX200 F6.3
- M10LXACF (Hole dia. 89mm): For Meade 10" LX90ACF/LX200ACF
- M12LX200 (Hole dia. 89mm): For Meade 12" LX200/LX200GPS
- M12LX200ACF (Hole dia. 92mm): For Meade 12" LX200ACF
- M14LX200 (Hole dia. 130mm): For Meade 14" LX200/LX200GPS
- M14LXACF (Hole dia. 136mm): For Meade 14" LX200ACF
- M16LX200 (Hole dia. 115.5mm): For Meade 16" LX200/LX200GPS
Additional Notes:
- 14" and larger masks come in 6 sections, all others are 3 sections.
- 10" f/6.3, 14" and 16" masks listed above are available by special order. Please contact us if interested.
BuckeyeStargazer's items are made out of PETG plastic and can handle temperatures of up to 80°C (175°F).
Instructions for use:
1. Make sure your scope has cooled to ambient temperature.
2. Point the scope at a bright star that is high in elevation.
3. Place the mask on the scope. Orient the mask such that the three snap fit connection lines point to the 3 collimation screws on the Secondary as shown in the scope image above.
4. A camera works best, but you can also use a high magnification eyepiece. Grossly defocus the star. You should see three arcs that correspond to the three cutouts.
5. As you bring the star closer to focus the curves will change into lines pointing to a common center.
6. Use the lines to adjust the collimation screw opposite the line. As you adjust the screw the line will move toward the center. The goal is to form a perfect Y where the lines touch in the center.
Duncan Mask for SCT Collimation - For Meade Telescopes
Important note:
Duncan masks are a collimation aid. These can be used in conjunction with collimation knobs sold by Bob's Knobs and others. Duncan masks can also be used for rough focusing but they are not effective tools for critical focus work. For that, you may want to look at Bahtinov or TriBahtinov masks instead.
Please note that this is a 3d printed plastic part.
A Duncan Mask can be used to easily and quickly collimate the secondary mirror of your SCT. Instructions are provided below.
BuckeyeStargazer's Duncan collimations masks comes in sections that "snap-fit" together and can be taken apart for easier storage. They are available for many different Meade SCT telescopes as listed below. Masks for Celestron SCTs are available separately.
Sizes:
- M8 (Hole dia. 77mm): For Meade 8" Model LX200/GPS/ACF/LX90/GPS/ACF/LS90ACF/2080
- M10 (Hole dia. 78mm): For Meade 10" 2120/LX3/LX50/LX90/LX90GPS/LX200 Classic/LX200GPS/2120 F10
- M10LXEMC (Hole dia. 87mm): For Meade 10" LX200 EMC
- M10LXF6.3 (Hole dia. 85mm):For Meade 10" LX200 F6.3
- M10LXACF (Hole dia. 89mm): For Meade 10" LX90ACF/LX200ACF
- M12LX200 (Hole dia. 89mm): For Meade 12" LX200/LX200GPS
- M12LX200ACF (Hole dia. 92mm): For Meade 12" LX200ACF
- M14LX200 (Hole dia. 130mm): For Meade 14" LX200/LX200GPS
- M14LXACF (Hole dia. 136mm): For Meade 14" LX200ACF
- M16LX200 (Hole dia. 115.5mm): For Meade 16" LX200/LX200GPS
Additional Notes:
- 14" and larger masks come in 6 sections, all others are 3 sections.
- 10" f/6.3, 14" and 16" masks listed above are available by special order. Please contact us if interested.
BuckeyeStargazer's items are made out of PETG plastic and can handle temperatures of up to 80°C (175°F).
Instructions for use:
1. Make sure your scope has cooled to ambient temperature.
2. Point the scope at a bright star that is high in elevation.
3. Place the mask on the scope. Orient the mask such that the three snap fit connection lines point to the 3 collimation screws on the Secondary as shown in the scope image above.
4. A camera works best, but you can also use a high magnification eyepiece. Grossly defocus the star. You should see three arcs that correspond to the three cutouts.
5. As you bring the star closer to focus the curves will change into lines pointing to a common center.
6. Use the lines to adjust the collimation screw opposite the line. As you adjust the screw the line will move toward the center. The goal is to form a perfect Y where the lines touch in the center.
Other Information
- Country of Manufacture: United States
BuckeyeStargazer Duncan Mask for SCT Collimation - For Meade Telescopes