Archived posting to the Leica Users Group, 1998/08/07
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]No way. Aluminum oxide is an extremely hard material that forms a solid film on aluminum metal. It cannot be wiped off. Rubies and sapphires are aluminum oxide with some impurities. This described material sounds like a lubricant or a soap used to clean the filter. Glen Robinson "Robert G. Stevens" <robsteve@istar.ca> on 08/07/98 02:31:19 PM Please respond to leica-users@mejac.palo-alto.ca.us To: leica-users@mejac.palo-alto.ca.us cc: (bcc: Glen M. Robinson/DSP/Imation) Subject: Re: [Leica] Strange thing with Leica R Circular Polarizer filter Pascal: This was probably oxidation of the aluminum. Robert >I have never seen this kind of behavior before. Anybody has any ideas? >Thanks. > >Pascal > >