Quote:
Originally Posted by Garyh
..... Also being a true Ritchey-Chrétien 2 mirror scope I always thought that they too suffer from coma unless there is some sort of corrective lense in the optic train? Correct me if I am wrong.....
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The RC has no coma, but does have Field Curvature and Off Axis Astigmatism. But this can easily be removed by (As you said) placing corrective lens's in line. Then you would have a really good scope.
But, what is inherent with this design is the collimation. It needs to be dead on.
Some say its not that hard to collimate, and others say its extremely hard.
Not having one, i cant answer which is true, but i would assume people who are not familiar with scopes may find it hard, but others who tinker with their scopes, may find it easier.
Theo.