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Old 16-11-2019, 01:45 PM
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Atmos (Colin)
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Atmos is offline
Join Date: Aug 2011
Location: Melbourne
Posts: 6,906
Originally Posted by Nikolas View Post
If it's the ED range which is the doublets then a field flattener is required, otherwise the Esprits as Colin said come with a flattener buit in.
Sorry if it came across that way, the flatteners aren't built in to the Esprit like some of the flat field Astrographs. The Esprit is a standard triplet but does come with a 2-3 element flattener that can be screwed into the focuser.
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