Is this phenomenon same as Newton rings? ----- Original Message ----- From: "ADavidhazy" <andpph@ritvax.rit.edu> To: "List for Photo/Imaging Educators - Professionals - Students" <photoforum@listserver.isc.rit.edu> Cc: <andpph@vmsmail.rit.edu> Sent: Monday, September 15, 2003 8:59 AM Subject: Re: Interference patterns in plastic > > Could it just be my scan or will all plastics be goofified by polarizing > > filters? > > Greg, > > Just about any transparent plastic extrusion will show these "interference" > lines - they become even more noticeable if the subject is placed between > polarizing filters. Generally the problem manifests itself because these > subjects are not annealed (allowed to cool slowly) and have embedded in them > stress patterns established during the molding process. > > The colored lines are actually an indication that they were preferentially > passed by the on-camera polarizer while the rest of the colors were mostly > absorbed. So it not quite an interference effect in the classic sense of the > word. At least I think so at this time unless someone who really knows tells me > otherwise! > > cheers, > andy > > > > >
