- CELESTRON C8 SERIAL NUMBERS RSX11M+ Feb 25, 2021 Serial Derived production number Optics number Motor date Reported sale date Comments Source of information CL = Craigs List CN = Cloudy Nights FB = FaceBook FL = Flicker.
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Special Note:
In 1987 Celestron production numbers were reduced while the quality was improved. Some of the production cuts were ordered by Alan Hale to allow production technique improvements to be instituted, while some reductions were simply due to waning demand as the post Comet Halley industry-wide hangover revealed the market was saturated. Hollow knight free. Tom Johnson and an early C8. In 1970, Celestron introduced the C8, an 8' f/10 Schmidt-Cassegrain. It sold for $795. The scope was an immediate success, offering high quality optics in a compact package that was reasonably affordable. This was during a time when almost all telescopes were handmade Newtonian reflectors.
The Celestron SCT uses either standard 6-32 or metric M3 collimation screws. It is important to order the correct knobs for your telescope. Allen and set-style factory collimation screws have standard threads. For Phillips collimation screws, the general rule is: Silver are standard; Black are metric. There are exceptions to this rule for black Phillips screws, so we have developed some hints to help you to determine which type of black Phillips collimation screw your telescope uses. Moreover, there are even exceptions to the hints, so if you are unsure of the type of screw in your telescope, you can either 1) pull a single collimation screw and check its threads using the guidelines at the bottom of this page; or 2) order both standard and metric knobs and return those that aren’t needed for a full refund._______________________________
Example 1: Black Phillips Collimation Screws
Textured secondary surface with serial number sticker and “CELESTRON” imprint in upper case lettering. Collimation screws are surrounded by a thin ring of smooth plastic and are slightly countersunk into the secondary housing. This is the most common black Phillips configuration.
Type of collimation screw: Metric
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Example 2: Black Phillips Collimation Screws
Textured secondary surface with serial number sticker and 'Celestron' imprint in upper and lower case lettering. Collimation screws are surrounded by normal surface texturing and are not countersunk.
Type of collimation screw: Standard
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Example 3: Black Phillips Collimation Screws
Nearly smooth secondary surface with serial number sticker but no “Celestron” imprint. Screws are slightly countersunk.
Type of collimation screw: Can be either Standard or Metric_______________________________
Example 4: Black Phillips Collimation Screws
Smooth secondary surface with serial number sticker and “CELESTRON” imprint in upper case lettering. Screws are slightly countersunk.
Type of collimation screw: Can be either Standard or Metric
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Example 5: Black Phillips Collimation Screws
Fastar secondary with label. Scope can be either with or without EdgeHD optics. (Note: EdgeHD and non-EdgeHD require different knobs.)
Celestron C8 Serial Numbers
Type of collimation screw: Metric_______________________________
Example 6: Black Phillips Collimation Screws
Hyperstar compatible secondary. Collimation screws are deeply countersunk into the secondary housing.
Type of collimation screw: Metric
Celestron C8 Serial Numbers
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If you decide to remove a Celestron 8” SCT collimation screw, here's how to determine if the screw has standard or metric threads. (Our knobs are shown in the photograph.) Both factory screws have about the same thread length below the screw head. The metric screw is slightly smaller in diameter, but that isn't really helpful without having samples of both screws. The best way to determine screw type is to count threads. The standard screw has about 10 thread turns over its 5/16 inch length, and the metric screw has about 16 thread turns over its 8 mm length. (Exception: The C8 EdgeHD with black Phillips collimation screws and the Fastar secondary has a longer 12 mm black Phillips secondary collimation screw. This screw is metric with 24 thread turns over its length.) Please contact us using the link below for guidance if you have further questions.I just ran across a Celestron C8 Orange tube with all the original components as well as a couple extras in mint condition. I bought it on the spot as I haven’t seen one this clean and organized in awhile. I bought if from a younger fella who said he got it when his uncle passed on(uncle was the original owner). The serial number is 289097. The best I can figure from what I researched is this scope was made around 1975/76. Hoping maybe someone here may know a little more; appreciate any comments or suggestions. I took it out already and am just amazed at how nice this scope operates. Clear sharp images, buttery smooth focuser; minimal vibration with the original “locked triangle” tripod. Absolutely pleased with this purchase.