Quote:
Originally Posted by Peter.M
I too have reservations about the level of correction at such a fast focal ratio which is why I asked if anyone was using one.
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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.