G'day, I am looking at the 2 element 2.7" unmounted lens set Star Instruments suggest (as Jason mentions) - comes from the 10"RC astrograph kit costs about $500UUS. Certianly not in the league of a big custom made corrector for the 20. I am going to build it in from the start - but it will be in some sort of adjustable cell mount. I like the idea of castings - I made my own set of Al cast side bearings for my 20" dob - but I had a fair bit of trouble with the foundry. Castings certainly are the most cost effective route to go, providing the foundry is cooperative. I will only be getting the basic precision cuts and holes done with CNC in the 6061 5/8" plate to save $. The detailing I will do with my own small drill mill. I am out-sourcing threaded pipe/tube etc for the mirror cell barrel however - my machining skills are basic only. guy
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Re: My thread for building a 12.5" RC.
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