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Midnight Dan
professor emeritus
Reged: 01/23/08
Posts: 560
Loc: Brockport, NY
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Re: The best Celestron 8" SCT OTA ever?
08/05/08 07:45 PM
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Keep in mind that any front-surface mirror such as in an SCT or reflector will degrade with time. The aluminum coating will oxidize on both the primary and secondary mirrors. Its a slow process, but given 10 or 15 years, it's a noticeable difference. So based on this, I'd say that the current releases are potentially the best especially with the newest anti-reflective coatings.
The coatings are not something to be taken lightly. I read a study done by Dr. Clay of ArkSky regarding the latest coatings on the Meade SCTs and he concluded that their claims of 20% improved light transmission were accurate! That was Meade, not Celestron, but one might assume that the latest Celestron coatings achieve similar improvements over older ones.
-Dan
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Scopes: Celestron NexStar 8, Orion EON 72mm ED/APO on Astroview mount (EQ3)
Eyepieces: Celestron 40mm, 25mm, Baader Hyperion 13mm, 8mm, 5mm
Other: Telrad, 2x Barlow, 0.63x Focal Reducer, Dew-not strips, DewBuster controller
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