Alfeo Dixon Posted July 27, 2010 Share Posted July 27, 2010 I wanted to explore the usage and differences of using a circular or linear pola filter. Are there any benefits of one or the other? Applications that may call for either? I'm well aware that auto focus will not work with linear pola filters, but I am not concerned with auto focus. Link to comment Share on other sites More sharing options...
Premium Member John Sprung Posted July 27, 2010 Premium Member Share Posted July 27, 2010 Linear polarization has long been used on cameras to make the sky blue and reduce kicks from shiny objects. Circular polarization is used in some versions of 3D projection to separate the images to your eyes using glasses, but I haven't heard of it being used in shooting. If it is, I'll be interested to see what it does. -- J.S. Link to comment Share on other sites More sharing options...
William Coss Posted July 27, 2010 Share Posted July 27, 2010 Using a linear pola on certain film cameras will conflict with the video tap optics. I always took it as a "grain of salt", almost an "urban myth" of sorts. Arricam ST, just filling in for the day. Couldn't believe this assistant's filter was even on the truck. Bill Link to comment Share on other sites More sharing options...
Brian Drysdale Posted July 27, 2010 Share Posted July 27, 2010 People seem to use the circular on the 3 chip video cameras, although I've used a linear pola on 2/3" cameras without any issues. Link to comment Share on other sites More sharing options...
Frank Kistemann Posted July 27, 2010 Share Posted July 27, 2010 A circular polarizer is essentially nothing else than a linear one with a layer of 1/4 wave retarder plate on it's back (the side facing the lens). Due to that retarder, the plane in which the lightwave is moving, rotates around the wave's axis, so that it would look a bit like a corkscrew. Thus the light could pass through a second polarizer and you won't get any cross-polarization effect, which is important when you work with a system that has another polarizing element like an autofocus or the video assist of some film cameras. Frank Link to comment Share on other sites More sharing options...
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