Quote:
Originally Posted by chrisc
Are the optical properties of the Celestron Edge SCT scopes and Meade's LX-200-ACF series essentially the same, in terms of reduction of coma / flat field, etc.?
How significant is the difference between a lower-end SCT, say a Celestron C8, and one of the above instruments?
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Celestron have both spherical primary and secondary. They have a fair bit of coma. The HD range has the same optics but an added doublet inside the baffle tube to correct the field.
So when you remove the secondary you can use the same hyperstar as the non HD range.
The Meade has an hyperbolic secondary from what I hear to deal with coma. I never used or looked into one but I hear they're very good. I don't know if there is an hyperstar available for the Meade SCTs.
Celestron have good optics regardless of the aperture, whether you look at a C8 or C14.