Mike, Sorry, have to disagree with you.
A circular polarizer does not "de-polarize", it rearranges the orientation of the light waves. As these have already passed through the linear polarizer they are all travelling in the same plane. When crossed, the circular polarizer will allow through those waves at the same orientation. Thus, the circular polarizer will pass some previously polarized light, potentially effecting the metering. Try it. Regards, Craig Z ----- Original Message ----- From: "Michael J. Shupe" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, February 04, 2002 8:35 PM Subject: Re: EOS Exposure factors for extension tubes > Craig, > > As long as he has a Circular polarizer on the lens, the linear polarizer > on the light table will not cause a problem. The Circular pol. > effectively "de-polarizes" the light that reaches the metering system, > eye piece and AF sensor. > > But you are right, two circular polarizers, if they are both orented > with the quarter wave plate toward the camera will not work for > photographing stresses in plastics. > > Mike * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
