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Believe Bintel had its dob mirrors - which I understand are GSOs - tested in Germany about 2003 using 'null ronchi images' and an 'interfererogram' which indicated an average Strehl ratio of 0.95. I have absolutely no idea what that means - I've simply copied it from a Test Report in Nov/Dec 03 Sky and Space on the Bintel 302 which I got from Bintel and that Report says it would indicate 'very good to excellent quality'. The Report gave the optics a good write up. Can't say whether its still the same but I intend to buy a Bintel 302 dob in next couple of weeks.
Eric
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