View Single Post
  #16  
Old 28-12-2018, 12:30 PM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
 
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.
Reply With Quote