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Building the Skybadger 12 ” CassegrainThis page is about designing and building the Skybadger 12” Cassegrain telescope. It draws heavily on advice from both Texeraux and Van Rooij regarding how to design a Cassegrain tgelescope and the sizing of components for best resolution, coma and field illumination behaviour. I purchased the mirror set for the Cassegrain telescope from Crawley Astrosoc in September 2010. The mirrors came already mounted in plywood frames (for the primary) and a single-arm metal holder for the secondary. Their original telescope design can be seen in these two pictures.. There was nothing left of the tube but rotting bits when the telescope was cleared from an inheritance clearout request to Crawley. So all I have to work with is the pictures and some designs that are rumoured to exist within Crawley Astrosoc papers (but a copy is promised if it surfaces). The primary is inscribed on the back, fortunately, with: |
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