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Ritchey-Chretien collimation
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28-12-2018, 12:30 PM
RickS
(Rick)
PI cult recruiter
Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
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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