I would avoid compressed air since the cans contain a slight amount of fluid that can damage coatings the following is from my previous link: USING COMPRESSED AIR: DON'T. Period. Dusting is easy, although it may take a little more time, and it is more effective. I have found that compressed air is virtually worthless for attempting to gently remove embedded particles on a glass surface and the chances of the liquid propellants within the can being expelled in liquid droplets against the glass is quite great. -----Original Message----- From: utah-astronomy-bounces+djcolton=piol.com@mailman.xmission.com [mailto:utah-astronomy-bounces+djcolton=piol.com@mailman.xmission.com] On Behalf Of diveboss@xmission.com Sent: Monday, May 07, 2007 1:27 PM To: utah-astronomy@mailman.xmission.com Subject: Re: [Utah-astronomy] dirty lens You should probably use some of that compressed air they sell at camera stores to gently blow the dust off first. The finish of the corrector plate is critical to the overall view through your scope. With rifle scopes, we use compressed air first, and then move to a liquid cleaner to "float" the remaining debris away from the lense. I would think that is what you would need to do to your 12" Meade. Quoting Joe Bauman <bau@desnews.com>:
My outermost lens is pretty dusty on my SCT 12". (Sorry, I can't remember what it's called -- is it a corrector plate?) Would it harm my telescope to gently dust it off with a specialty cloth used for computer screens? Any suggestions? Many thanks, Joe
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