Quote:
Originally Posted by alexandre
Hy John .
Bravo for this very beautiful image!
I look at it with a big interest, because the RH200 is a telescope which I shall buy for to exploit of the big field rather quickly.
But on the image I notice that stars are not perfectly round, why?
Bye for now! 
@lex |
Well.... that is because it is not a perfect telescope. It is difficult to collimate and over time requires collimation tuning. You would be better off with the FSQ for big image circle with very sharp stars to the corners. If you are adverse to telescope adjustments, the RH200 f/3 not the scope for you. It's an expensive little instrument that requires a bit of TLC. Large central obstruction, small image circle, many optical surfaces, heavy tube assembly, prone to differential flexure. That may sound critical of me, but it is the truth.