Chuck D. Clawson, MI, USAProud owner of: Orion XT10i w/ Moonlite focuser & ZOC mirror, Celestron Ultima 8 PEC, Celestron C5+, Meade 90mm f/11 achromat (Model #390), and some random accessories (see bio).
Celestron Nexstar 8SE, C6, TV Geniesis, Orion 4.5 Starblaster, Coranado PST, Discovery 8" DHQ, Orion 90mm F10.1 Binoculars:Nikon 7x35,Canon 8XIS, EP's 8 to 24 Hyperion, 2 TV zooms 55,32, TV plossel. 24,19,35 Panoptic, 16T5,11T6,7T6 and 5T6 Nagler CG5GT,TeleVue systems mount on ash tripod.
We mostly come out at night... mostly.
GSO Z8 Degree Circle & Digital Level
Celestron 4"(102mm) SLT 660mm f/6.47
2" 30mm GSO WideView
9mm GSO Plossl
ES 82's : 4.7mm, 8.8mm, 11mm, 18mm
BGO's 5mm, 6mm, 9mm
2" 2X ED Astronomics Barlow & GSO 1.25" 2x Shorty
8-24 Baader Zoom III
Baader M&SG, Semi-Apo
Orion XT12g 12" f/4.92 GoTo Dob Orion 9x50 RACI - Green Laser Pointer Orion 4.5" f/4 EP: ES82 30mm, ES68 24mm EP: Hyperion 21, 17, 13, 10, 8, 5mm Various filters, including Skyglow, UHC, O-III Celestron Ultima 2x Barlow Celestron 12x80 binoculars & mount
Quote:My opinion is once every year or two...depending on how much you are using the scope. Certainly if it's really getting grimy it can affect the view. If a bird poops on it or some kind of bug stuff gets on there it should be cleaned right away.