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I'm scared I have attained the debilitating Collimation Syndrome ( HClV-1a : Human Collimation Virus strain 1a. - mild/severe). Was out with Calpernia yesterday (ehm..my scope's second name..) and I decided to correct her eyesight..again.. (She's now 11 month's old...her first name is Sky, her surname Watcher, 10" of joy..) I followed my baby's collimation guide (I mean Astrobaby..sorry..) And to my surprise the collicap worked (which I have never tried before) very well... I could see all the six mirror clips on my primary mirror..but it seemed like the clips were not evenly spaced with reference to the side of the secondary mirror's edge. As explained in AstroBaby's guide.. "The photograph to the left shows what the actual view should be like at this stage of the process. Note the three mirror clips are all visible and are all equally close to the edge of the secondary mirror and the secondary is showing round and centred to the focuser tube ( the dark area at the edges of the picture)." (Astrobaby, 19..) source: http://www.astro-baby.com/astro_baby_telescope_help_and_advice.htm. Collimation Guide for Newtonian Reflector Telescopes. I checked with my Cheshire...it showed that (according to the Cheshire) the secondary didn't appear quite cylindrical in the tube. So now I recollimated the whole thing...using my trusted Cheshire...and everything is bang on.. When I insert the colli cap thereafter I can see all the clips, almost all the same size, but still with a slight miscorrection of spacing around the secondary's edge.. Maybe I'm just getting old, and my eyes are tired..