« Schmitt-Cassegrain Collimation Made Easy Using a Duncan Mask

4-Steps-of-Using-a-Duncan-M

4-Steps-of-Using-a-Duncan-M

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1) Image seen upon placing Duncan Mask on SCT. 2) Adjust focus and 3 straight lines are seen. 3) Adjust collimation screws to form a capital “Y”. 4) Perfect focus achieved.

4-Steps-of-Using-a-Duncan-Mask

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