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Hi Daniel,
One difference between the RC and the Newtonian is that the RC is from the class of Cassegrain designs.
RC scopes are mainly for photographic work and is about the best one can do with 2 mirrors.
The two mirrors are hyperboloidal and must be matched exactly in shape.
When properly aligned there will be no coma or spherical aberration (The Newtonian has this in abundance off axis !!)
Their main call to fame is that the stars are are round but the scope suffers from astigmatism off axis - so aligning one of these scopes is not one of life's better experiences.
Jeremy
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