On 29/07/07, Roman <[EMAIL PROTECTED]> wrote: > Isopropanol had killed a focusing screen of my *istDL. While it doesnt > affect the image camera makes I regret I applied Isopropanol, or > Kinetronics PCS liquid on focusing screen. They had warning against > using it with contact lenses. I should have thought f-screen may be of > alike materials. PCS is too aggressive and had melted the surface of the > f-screen.
The fragility of focus screens has been discussed recently in other forums as people seem to be damaging them. Personally I wouldn't touch one with anything more "aggressive" than plain soap and distilled water. There has been conjecture that they may be molded from polystyrene, in that case contact from as little as remnant citrus oils on your fingers could cause permanent damage. Best option is to firstly not get them dirty and secondly use nothing stronger than compressed air to clean them. -- Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://picasaweb.google.com/distudio/PESO http://home.swiftdsl.com.au/~distudio//publications/ Pentax user since 1986, PDMLer since 1998 -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
