Quote:Well I decided that a faulty USA made Starbright 9.25 I received had to go and purchased a new orange tube C8. To be honest I was not expecting much from a C8 due to the decreased aperture and increased field curvature. The C8 in question is a Nextstar C8 XLT fastar model sold by Highpoint. A visual inspection of the scope revealed good-to very good mechanics, exception being the corrector retaining ring being warped and slightly bent where the screws attach to the front cell. The package includes the very skimpy and barely functional accessories; luckily I had a 99% dielectric diagonal and some good quality EPs. Seeing conditions were far from ideal for a first light but did improve as the night progressed, I would say 2/5 seeing checking the CSC for my area. With the scope cooled and collimated I took a glance at Polaris to perform a star test. Man was I chocked! The star pattern looked almost identical with equal in and out of focus range. The CO shadow was identical in size with 4.5mm defocus in and out of focus. The defocused rings at 300X, defocused to 3-4 showed equal brightness and texture on both sides of focus, sometimes It was difficult determining which side of focus I was in, they were so similar. There was no noticeable image shift as focus was reached! The star test pattern looked better than my Intes scope. Aimed the C8 towards Jupiter and the view was spectacular, I could easily see detail within and around the GRS, the South temperate belt showing plenty of swirls and detail, the southern equatorial belt showed the vast turbulence seen in pictures especially around the GRS and a multitude of colors ,ovals, festoons and cloud markings. This was all seen in 2/5 seeing with wispy light clouds blocking my view here in South FL. Focus was easily achieved quickly without ambiguity. Trapezium showed all 6 stars clearly and with good nebulosity. I lack the critical experience to numerically judge the optics on this C8, but with a better visual experience than the Intes 1/8 wave .97 strehl and the ED100. I would say this C8 is “diffraction limited” excluding CO. Looks like my optically excellent ED100 will be up for sale soon, it appears Celestron is getting their “stuff” together or I got lucky.
.... back yard astronomer ================= Don't forget to look at the moon often. Its a play ground of fun if you throttle up the magnification!
Quote:I think you are right on both counts: Celestron got its QC. under control and you got lucky. Those XLT coatings with what looks like a levitating secondary are something huh ? Glad to hear your success story.Pete