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Hi Duncan.
Getting the itch...again...your worse than me mate. How many scopes is that weve seen you buy over the last year lol.
I thought, and I'm probably wrong, that coma and vignetting were both caused by the parabolic nature of the mirror/lense and the an RC design provides the flatest fied possible with todays (amature) scopes. Even though the RC has a parabolic mirror there is a corrector in there somewhere?
Thanks
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