Quote:
Originally Posted by Nikolas
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.
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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.