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Old 14-05-2020, 02:58 PM
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mental4astro (Alexander)

mental4astro is offline
Join Date: Jun 2008
Location: sydney, australia
Posts: 4,902
Originally Posted by cken View Post
Is that means C 11 + F6.3 = EDGE 11?

It means that the effective focal length is 1764mm, and the focal plane is now flat across the whole field.

The Edge 11 has a flat focal plane from the very start at its native focal length of 2800mm.

I know how confusing it can get. Best to think of the Edge scopes and the standard SCT's as two totally different systems, each with its own set of optical features/differences. They look similar, but that's where the similarities end. Much in the same way as with Maksutovs, RC's and Dall Kirkhams - these are also all Cassegrain telescopes, but all make use of different design variations and all have their own photo accessories that are not interchangeable (except for barlow lenses).
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