Description

Buckeye Duncan Mask for SCT Collimation

A Duncan Mask can be used to easily and quickly collimate your SCT. Instructions are provided below.    

The mask comes in three sections that snap-fit together and can be taken apart for easier storage (C5 and C6 are one piece, 14 and larger are 6 sections). 

Feel free to contact me if you do not see your scope listed.

 

Technical Specifications

Printed in durable, temperature tolerant PETG filament.

Duncan-C5		Duncan Mask Celestron C5
Duncan-C8-NF		Duncan Mask Celestron C8 (non-Fastar, pre-1998)
Duncan-C9.25-NF		Duncan Mask Celestron C9.25 (non-Fastar, pre-1998)
Duncan-CClassic8		Duncan Mask Celestron Classic 8
Duncan-C11-NF		Duncan Mask Celestron C11 (non-Fastar, pre-1998)
Duncan-C14-NF		Duncan Mask Celestrong C14 (non-Fastar)
Duncan-C6		Duncan Mask Celestron C6
Duncan-C8		Duncan Mask Celestron C8 (including Ultima 2000)
Duncan-C9.25		Duncan Mask Celestron C9.25
Duncan-C11		Duncan Mask Celestron C11
Duncan-C14		Duncan Mask Celestron C14
Duncan-M8		Duncan Mask Meade 8 LX200 LX200GPS LX90 LX90GPS LX50 Model 2080 (F10)
Duncan-M8F6.3		Duncan Mask Meade 8 Model 2080 (F6.3)
Duncan-M8LXACF		Duncan Mask Meade 8 LX90ACF LX200ACF LS8ACF
Duncan-M10		Duncan Mask Meade 10 LX200 LX200GPS LX90 LX90GPS LX50 Model 2120 (F10)
Duncan-M10LXF6.3		Duncan Mask Meade 10 LX200 F6.3
Duncan-M10LXACF		Duncan Mask Meade 10 LX90ACF LX200ACF
Duncan-M10LX600-850		Duncan Mask Meade 10 LX600ACF LX850ACF
Duncan-M10LXEMC		Duncan Mask Meade 10 LX200 EMC
Duncan-M12LX200		Duncan Mask Meade 12 LX200 LX200GPS
Duncan-M12LX850		Duncan Mask Meade 12 LX850
Duncan-M14LX200		Duncan Mask Meade 14 LX200 LX200GPS
Duncan-M14LXACF		Duncan Mask Meade 14 LX200ACF
Duncan-M14LX850		Duncan Mask Meade 14 LX850
Duncan-M16LX200		Duncan Mask Meade 16 LX200 LX200GPS
Duncan-M16ACF-F8		Duncan Mask Meade 16 ACF F8
Duncan-GSO16RC		Duncan Mask 16 GSO RC (Astro-Tech, TPO, iOptron, Orion, etc.)
Duncan-Tak-Mew180		Duncan Mask Takahashi Mewlon 180

Manual & Warranty

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 to the left. 

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.  

Size

Duncan-C5, Duncan-C8-NF, Duncan-C9.25-NF, Duncan-CClassic8, Duncan-C11-NF, Duncan-C14-NF, Duncan-C6, Duncan-C8, Duncan-C9.25, Duncan-C11, Duncan-C14, Duncan-M8, Duncan-M8F6.3, Duncan-M8LXACF, Duncan-M10, Duncan-M10LXF6.3, Duncan-M10LXACF, Duncan-M10LX600-850, Duncan-M10LXEMC, Duncan-M12LX200, Duncan-M12LX850, Duncan-M14LX200, Duncan-M14LXACF, Duncan-M14LX850, Duncan-M16LX200, Duncan-M16ACF-F8, Duncan-GSO16RC, Duncan-Tak-Mew180