Google "Collimating the Vintage C90".Įven if such information does not appear to have a visible place in the Registry, I will make an effort to capture it. There's a 2006 article about the whole procedure. ![]() The retaining ring can be substituted with a rubber O-ring after collimation. I don't think it was ever collimated at all. This leaves the mirror attached only to the spring and free to be adjusted with the three knurled screws without inducing stress on the mirror. Collimation requires extra careful removal of the retaining ring that presses a plastic washer over the mirror to hold it against the spring to which the mirror is attached with epoxy. ![]() The views with my wide field eyepieces are great. The adapter is homemade, simple but functional. I have been using this one on my Astroview equatorial mount. Many thanks for the information on the years of manufacture. My f5.6 model gets 4.75˚ which is hard to appreciate. I enjoy their near 2.5˚ FOV with a 40mm eyepiece. ![]() The C90 f11s are excellent candidates for mounting on a friendly GEM or EQ. Our records aren't complete enough to be certain, and serial numbers in this range are not date-coded, as some other earlier Celestron scopes were. Congratulations - You are one of the few who has reported being able to collimate one of these.įYI - I would guess your scope to have been manufactured in 1979 or 1980.
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