https://community.usa.canon.com/t5/EF-RF-Lenses/polarizers/m-p/58085#M15761 <P>whats the difference between a linear and a circular polarizer ? And what is best for reflex lenses ?&nbsp;</P> Wed, 01 Jan 2014 11:56:45 GMT frogpoet 2014-01-01T11:56:45Z https://community.usa.canon.com/t5/EF-RF-Lenses/polarizers/m-p/58085#M15761 <P>whats the difference between a linear and a circular polarizer ? And what is best for reflex lenses ?&nbsp;</P> Wed, 01 Jan 2014 11:56:45 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/polarizers/m-p/58085#M15761 frogpoet 2014-01-01T11:56:45Z https://community.usa.canon.com/t5/EF-RF-Lenses/polarizers/m-p/59123#M15762 <P>Did you ask this in another section? &nbsp;I thought this was just asked and answered.</P><P>&nbsp;</P><P>In any case, the basic polarizer is the "linear" polarizer -- but most modern cameras requrie a "circular" polarizer. &nbsp;</P><P>&nbsp;</P><P>A "circular" polarizer is a really a liinear polarizer... with a quarter-wave plate just behind the linear polarizing layer. &nbsp;This has the effect of twisting the polarity of the light AFTER it passes through the polarizer. &nbsp;Without this, the auto-focus and metering systems on DSLRs will struggle to accurately focus and meter the shot.</P><P>&nbsp;</P><P>If you have a DSLR, you must use a "circular" polarizer -- your camera will have issues attempting to use a simple "linear" polarizer.</P> Sun, 05 Jan 2014 04:28:22 GMT https://community.usa.canon.com/t5/EF-RF-Lenses/polarizers/m-p/59123#M15762 TCampbell 2014-01-05T04:28:22Z