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Posted by Poppa Chris
on Wednesday, September 18, 2013 10:38 PM
Try judging the need for cleaning by your view through the eyepiece. Can you see a blemish in your view? Chances are you can not since the image is focused on infinity. If it shows up in photos taken with the scope, taking flat frames and adding them to the image stack along with the Lights and Darks would remove most of the spotting artifact from th eimage.
Typically, one should avoid cleaning coated optics until really necessary. But if you really have to do it, a solution of 1 quart distilled water, 3 drops dishwashing detergent and 1/2 cup of rubbing alcohol works good. Or better yet, there are commercially available solutions and cleaning kits from several of the better telescope vendors such as Orion or Agena Astro.
Denham Springs, Louisiana USA
"Second star to the right - Then straight on until morning!" - Peter Pan
Celestron CPC1100GPS (XLT) - 279mm aperature, 2800mm Focal length. (f10) Celestron Ultima LX (70deg AFOV) Eyepieces 32mm thru 5mm, Canon EOS Rebel T2i DSLR, Backyard EOS imaging software, Orion Star Shoot Planetary Imager IV, Celestron Skymaster 15x70 binoculars