YES, I specifically remember having trouble with The HOYA HMC filters. They are really a bitch to Clean... jco
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Alan Chan Sent: Thursday, November 02, 2006 6:31 PM To: Pentax-Discuss Mail List Subject: Re: Best way to clean those difficult Multicoatings? > > On occasion I run into lenses and filters ( Usually not Pentax ) > > Which have nice multicoatings but are extremely difficult > > To get clean. I have tried alcohol, water, soapy water, > > Etc but these are a real pain and sometime I just give > > Up without getting them clean to my satisfaction. > > Anybody know what I am talking about here and what's your > > Best solution (pun intended)? Thanks in advance. > > JCO The most difficult coating I have ever dealt with is HOYA HMC. Pretty soft and easy to scur. After years of trying, the best solution is acetone. You read me right, acetone. The way I do it is quite straight forward. Fold a piece of toilet paper into a thick small cube, dip a bit acetone, then wipe the coating from centre to edge. Never rewipe. Voila! The coating will be clean as new, and I do mean NEW, no scratch, no mark, no hazy, nothing. Pure isopropyl alcohol works too but takes a little more skill. In fact they work so well I use them for CCD cleaning too. Dirt cheap and not as scary it may seem once you tried. But for CCD, you need a pair of metal tweezers. Regards, Alan Chan http://www.pbase.com/wlachan -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
