[toryglen-boy (Duncan)]

Originally Posted by White Rabbit

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

i was led to belive it was the opposite mate, the nature of the optical train gave a flat image, and there where no "correctors" in there at all !!