The Evolution 8 is, as the name suggests, an 8” (200mm) telescope. The advantage of an SCT telescope is that it is extremely short thanks to the fast primary mirror, but the actual focal ratio is f/10 after reflecting off of the secondary mirror. The SCT telescope uses a corrector plate in the front, an extremely fast f/2 primary, and a convex secondary mirror. The C8 is an SCT, or Schmidt-Cassegrain telescope. The Evolution 8 is available with an EdgeHD upgrade and a StarSense autoalign bundle, but we don’t see a reason to shell out the funds – the EdgeHD won’t perform any differently for visual use and the StarSense is unnecessary. Apart from updates to the coatings and manufacturing process, the C8 has changed little in terms of performance or design in the past 50 years – though Celestron does sell an EdgeHD C8 in various incarnations that have improved field flattening for astrophotography and ventilation holes. The Evolution 8 is the latest of Celestron’s 8” Schmidt-Cassegrains known as the C8, with design roots tracing back to the 1960s and the original orange-tube C8 having debuted in 1970.
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