Researcher

On 30/12/2018 at 10:30, Alan64 said:

Hello,

The Celestron "PowerSeeker" 127mm f/8 catadioptric is an economical alternative to a Celestron C5 or 5SE, a Schmidt-Cassegrain.  It's quite popular among the entry-level kits for that very reason.  I don't have one myself, not quite yet, but I will be getting one in future, and for an overhaul as I would want to get the best out it as well.

As with all reflectors, even the modified-Cassegrains(Schmidt and Maksutov), collimation, alignment of the optical system, is necessary, to be checked upon its arrival from the factory overseas, and occasionally thereafter as it's moved about and used.

The "PowerSeeker" 127mm sports a barlowing lens assembly at the end of the drawtube of the focusser, and may prove problematic when attempting to collimate the telescope...

http://www.whichtelescope.com/images/CatadioptricNewtonian2.gif

The telescope is not a conventional, traditional Newtonian, although "Newtonian" is at times included within vendor advertisements.  The telescope is, rather, a loose simulation of a rare design known as a Jones-Bird, which was developed in the U.S. back in the 1940s and '50s.  The lens assembly, as noted above, makes collimating the telescope a bit difficult for those first starting out.  It's not impossible, however.  If you intend to keep the kit, I would strongly suggest researching online the methods used to collimate one, and for sharp and pleasing images throughout its range of magnifications.  Use the phrase "Bird Jones collimation" when searching with your favourite web-browser.  There are also a few YouTube videos available on the subject.

Best of luck, and enjoy.

i know it was years ago but... how was your experience with that telescope?