About this product
Model: bes_duncan_bahtinov_c5_50mm
BuckeyeStargazer Duncan Mask for SCT Collimation.
A Duncan Mask can be used to easily and quickly collimate your SCT.
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 three 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 centre.
6. Use the lines to adjust the collimation screw opposite the line. As you adjust the screw, the line will move toward the centre. The goal is to form a perfect Y where the lines touch in the centre.
The mask comes in three snap-fit sections and can be taken apart for easy storage (C5 and C6 are one piece).
Hyperstar Note: The C6, C8, C9.25, C11, and C14 Duncan Masks accommodate both Hyperstar and native Fastar/secondary mirror configurations. The central hole is sized for the Hyperstar, and the mask includes a snap-fit bushing to decrease the diameter of the Fastar ring.
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