Well clear skies at last ! All my comments are subjective, in that I,m in no position to interpret star tests. So my 10in f3.3 mirror is , in my opinion a keeper, thank goodness.The mirror is UNCOATED.
Moon very sharp, mountain tips on terminator sharply silhouetted against dark sky background.Uncoated mirror reduced glare, so detail on lunar surface was spectacular.Orion Nebula extensive,much better than I thought it would be uncoated, and I could see all 4x trapezium stars at 100x . Similarly Eta Carina nebula was visible , and enjoyable.Scanning the Milky Way was fun and amazingly for f3.3 coma was not at all bad ! Not what I had been led to believe by any means. My simple cheap GSO Coma corrector ( modified as per above in pinned posts) cleaned it up nicely ! So much for " cheap Chinese optics" ! Attempts at star testing were "dismal". Mirror looked better outside of focus than inside, although the shadow of the secondary looked similar both sides. About all I can say - this is NOT the best mirror on the block, but it works to me very well visually up to 250x , however the view is pretty dim at this magnifcation uncoated, so really cannot fully judge.This mirror is 19mm float annealed glass, mounted on a 6x point cell in a 12in epoxied Sonotube.No signs of astigmatism fortunately.So what is my reaction to fast mirrors, after 6yrs using a 10in f4.7 Zambuto Dob, home built ? You obviously can,t compare the optics, Carl,s mirror is supurb on Planets and stars etc.But the f3.3 is still very good for wide field Milky Way cruising, and DSO hunting , and does NOT disappoint me in any way - in fact I get great satisfaction as an 83yr old , to think I made a fast thin mirror that works as well as this does, and it took only four months to grind/figure start to finish.The real test will be the Planets later in the year - I,m not getting up early morning in a NZ winter to view them ! However this scope was built for Deep Sky cruising and not Solar System stuff - the Zambuto is for that.
One thing I noticed immediately I used the fast optics was how CRITICAL focus is, it is right there, no " give and take " a fraction, its either in or out of focus sharply.In fact its at the edge of usefullness of my GSO Micro Edge focuser, but I,m leaving my Feathertouch on the Zambuto scope.So I,m happy with the mirror, and It,s off to be coated. Don,t think I,ll " be allowed" to make another one, as the house needs a touch up paint job, and guess whose doing it ! MACLEOD