The Optical Tube
The SkyProdigy 6 uses Celestron’s standard C6 optical tube, which was introduced in 2006. A 6” f/10 Schmidt-Cassegrain, the C6 is a great performer and fits in a very compact package. The C6 is compatible with Starizona’s HyperStar technology to turn it into an ultra-fast f/2 Schmidt Camera (though you’d need a proper equatorial mount and of course a CCD or CMOS camera to attach to it). It will also work with a 2” diagonal or, for both visual and photographic use, Celestron’s f/6.3 reducer, and a variety of adapters can also attach to the back thanks to the scope’s standardized rear threads.
Thanks to its small size, the C6’s manufacturing tolerances are a lot less stringent than a larger Schmidt-Cassegrain and as a result, the optics tend to be top-notch.
Like all Schmidt-Cassegrain telescopes sold by Celestron and Meade, the C6 focuses by moving the primary mirror along a threaded rod. This can sometimes result in an issue known as image shift where the image tends to jiggle when focusing at high magnifications as the mirror flops on the rod. Thankfully the C6’s small primary mirror also doesn’t weigh much, so image shift tends to not ...