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Duncan Mask for Celestron CPC8

by mr_milo

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astronomy telescope Celestron Celestron CPC collimation SCT astronomy telescope Celestron Celestron CPC collimation SCT

This is my 3D printed version of the Duncan mask I previously made out of foam sheets.

I first saw the idea at: http://alpha-lyrae.co.uk/2013/12/31/schmitt-cassegrain-collimation-made-easy-using-a-duncan-mask/

I then made a foam sheet version of it which I posted at Cloudynights.com: https://www.cloudynights.com/topic/585763-collimate-collimate-collimate-you-will-be-glad-you-did/page-2

Finally when I got access to a large format 3D printer I transfered the design to FreeCAD and have pri

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