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Thanks all
The scope's mirror was made my Mark Sutching, so is nice and accurate (full thickness Pyrex) , its recently been coated by Issacc of Chi Qin Co in Sydney (Quartz o/coated), and I use a Multipurpose Coma Corrector (MPCC). Thats amazing, eliminating all coma. The image is full frame no cropping. (350D has 2/3 sized sensor). So, yes the MPCC is the best thing for any Newtonian from about F4 to F6, even working on my 6 inch F3.6 meade Schmidt Newtonian
Scott
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