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Many thanks everyone for the feedback. That was quick!
Yeah Jove. Spot on. It looks to be 25mm. So with the substrate they call Zenador I think, a fused quartz like substrate, I would have thought it make a difference limiting deformation.
Also, that's a great suggestion Stefan, I'll try the mirror rotation tonight.
So..... these testing results could be tailored for a set outcome.......Why doesnt that surprise me!
Anyway I can plan to move forward from here after a mirror rotation check.
So contemplating an F5 GSO mirror but Ill have to extend the scope. It looks like the quality range is OK to excellent and all diffraction limited as a minimum. With GSO, they have had years of fine tuning behind them by now, so I imagine they're a good bet. Their mirrors seem thick and weigh a kilo more. Its got to be better than what I have now I imagine!
Also, I tracked down a German company, AstroReflect and they work with TS doing premium mirrors. I can get an F4.8 but at 2.5x the cost of a GSO.
Any suggestions appreciated.
Thanks again..
Dan
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