"A telescope is either good or cheap, not both" - but sometimes you get lucky!
150mm MCT f/13, 31% CO
"People say I'm in denial. I disagree."
OTA: 1979 vintage C-8, Stellarvue AT1010 Mount: CG5-GT Imager: Canon XS(unmodded) Celestron 6.3 Focal reducer Orion SSAG/Mag Mini Guider Astronomik CLS clip filter Various accessories For what could be more beautiful than the heavens which contain all beautiful things? - Nicolaus Copernicus
Quote:In the case of my scope, a previous owner had obviously removed the rear cell It was loose on the main tube, leading to a tilted, and tilting primary, which made collimation impossible and images astigmatic.
Quote:If you do have any run out (mine was about 2mm), then loosen the nuts/screws that hold the rear casting to the OTA and use a piece of wood and mallet to gently tap the tube in the direction required. You will probably find the tube is seated hard back against the rear casting, so the initial adjustments are going to be tapping the front casting forwards away from the rear casting.
16" F/12 R-C with optics figured by Paul Jones mounted on Byers Research Grade Series II mount with Gemini II GOTO housed in 11.5' Sirius Observatory; C11 on G11;a few Ethoi and other longer focal length Televue eyepieces in the 2" format; a 6" F/10 refractor for which I made the achromatic objective.
George You know you're getting on when the equipment you farmed with is showing up as suburban lawn ornaments.