Quote:
Originally Posted by RickS
Planewave scopes aren't Ritchey–Chrétien. They are a corrected Dall-Kirkham. The difference is that the CDK has a spherical secondary and it doesn't matter if it isn't perfectly centred. This makes them somewhat easier to collimate.
Cheers,
Rick.
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Ok thanks. So the next question is, who, besides GSO makes RCs for the amateur market?