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By Mick AKA, Astrolounge.
I decieded to build myself an 8" scope primarily for reasonable wide field imaging at a medium f5 ratio. I have a rolling machine at work that we use for making body panels for custom cars and hot rods, so... I rolled an aluminium tube from .8 sheet and machined the rings from 20mm plate.
allow the mounting of side plates for easier attachment of other accessories such as the Stellavue 13x80 finder which will be fitted to this scope.
There is no need for extension tubes as the tube is made to come to focus with the camera and the tube is also fully baffled.
The scope was finished in white 2 pack baked enamel.
You can find the entire post on this topic
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I made them with flat angles to 
