Quote:
Originally Posted by multiweb
At shorter FL even if you manage to correct your imaging circle I doubt the tube and focuser mounting will be stiff enough and you might get flexure issues and collimation shifts unless you use a set of rings and brace it in position. Also do you think the optics quality is good enough. Just a thought. If you're set on building a F/3 system you might as well want to consider buying a quality primary/secondary pair then build from scratch rather than modding a GSO. Mechanically it's going to be a lot of work. Maybe get a good primary cell from Protostar or other and start from there.
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The idea would be that the gso mirrors are the only thing from them in the scope, the rest would be custom made from carbon fiber. If the system worked then it would be trivial to replace the mirrors with better quality ones.