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 Craig Zendel wrote: > > Miha, > > I believe you are trying to photograph the stress lines in transparent > plastic by "cross polarization (aka bi-refringence)". > > The sheet polarizer you are using on the light box will be, almost > certainly, a linear type. This can cause incorrect meter readings (mainly > underexposure). > Regards, > > Craig Z -- Michael Shupe M.J.Shupe Photography Michigan Tech University www.northernlightsgallery.com * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
