I have been told by several opticians only clean if you absolutely have to. The micro scratches that can result from aggressive cleaning can cause more optical degradation than dust and film on the surface of the optic. -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Rodger C. Fry Sent: Friday, February 06, 2009 1:56 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Frosty the Telescope Joe, Let me know how you clean your corrector plate and how it comes out. My 10" is three years old and I have yet to clean it but someday I will need to. With the UHTC coating I am hesitant to do anything. Good Luck in cleaning this. Rodger Fry ----- Original Message ----- From: "Joe Bauman" <josephmbauman@yahoo.com> To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Sent: Friday, February 06, 2009 1:29 PM Subject: Re: [Utah-astronomy] Frosty the Telescope Take a look at it close up: http://www.slas.us/gallery2/main.php?g2_itemId=968&g2_imageViewsIndex=1 -- Best wishes, Joe --- On Fri, 2/6/09, Canopus56 <canopus56@yahoo.com> wrote: From: Canopus56 <canopus56@yahoo.com> Subject: [Utah-astronomy] Frosty the Telescope To: "Utah Astronomy List Serv" <utah-astronomy@mailman.xmission.com> Date: Friday, February 6, 2009, 1:11 PM That's one frosty corrector plate. I've never seen anything like it! - Kurt http://deseretnews.com/media/images/blog/10000030-1233936496.jpg _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://gallery.utahastronomy.com Visit the Wiki: http://www.utahastronomy.com _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://gallery.utahastronomy.com Visit the Wiki: http://www.utahastronomy.com _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://gallery.utahastronomy.com Visit the Wiki: http://www.utahastronomy.com