Out of interest, I’ve been collecting serial numbers and, where reported sale/purchase date and any production date shown on the RA drive motors. The attached table has been built up from postings on CN, a few Astromart ads and a table on the Stargazers Lounge forum. Following suggestions made during discussions on another thread I have started this thread to serve as a registry for the C8s.There are three formats of SN:
There are some anomalies in the list (marked with an exclamation mark in the left hand column):
With regard to the later 8xxxxx series that came in about the time of the change from Celestron Pacific to Celestron International as there is no indication of a production date it is hard to be certain whether the sequential number is a continuous sequence or whether there are breaks in it. The highest number I have seen is 956651 which, if the sequence is continuous, suggests that 156,651 C8s since the change had been made by the time that ‘scope was produced.With the later 8xxxxx style SNs it helps to have the date code stamped on the RA drive motor(s) – in the few cases where I have found a motor date as well it seems as if some ‘scopes might have sat in stock for a while before being sold – of course it could also be that the motors sat in stock, either at the manufacturer or at Celestron for some time before being used.Any corrections, clarifications, additions gratefully received!7 Jan 2013 Edited: revised table with additional information highlighted in blue and column to record corrector SNs where known
8 Mar 2014 Further edit: Taking advantage of the ability under CN 2.0 to edit this post I've added a link to the Registry which now should always go to the latest version:
Celestron C8 Registry
"If you want to succeed in the world, you don't have to be much cleverer than other people. You just have to be one day earlier.” -- Leo Szilard
Cave Mirror Registry
1971 Cave 10" f/6 Custom Super Deluxe
1958 Cave 10" f/7 Model C De Luxe
1974 Cave 8" f/8 Model B Deluxe
1970 Cave 8" f/6 Lightweight Deluxe
1971 Unitron 145C
1 Caveman Award!
President Southwest Florida Astronomical Society, Inc.
Have Scopes, will observe!
"The White Zone is for loading or unloading of passengers only. No Astrophotography." Cosmic Acres! Greatest restoration challenge: Tulley and Sons 3" achromat on Altazimuth mount, circa ~late 1820s
Chris Celestron C8 "Orange Tube" Orion XT6 Dobsonian
Quote:I have a orange C8 from the early 80's that I was using last night. With the scope collimated and defocused on a bright star I see very nice rings. However, it almost looks like a very thin waterfall slooping down towards the center on one side. Is this an indication the secondary screws are to tight? I have never seen this before in any orange C8 I have had and I have had a few.
Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schiefspiegler,60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4" f/12, 4.5" f/16 & 6" f/12 Schupmann Medial refractors, 4" Celestar, 19 Stellafane awards 9 in optics Engineering = Taking what you have and making what you need.