 Bill Boswell |
Using a polarizer I replaced my old linear polarizer filters with new Nikon and Hoya circular polarizer filters to work with my Nikon F100. Is it just me or do these circular polarizer filters not work as well at removing reflection as the older liner polarizers did? I saw a great image through a store window recently but just couldn't remove the reflection which spoiled the whole image. I tried changing position and angle but the reflection wouldn't disappear as I turned the filter. I also find the effect of turning the sky darker blue doesn't seem as dramatic as it did with the older linear polarizers. Any thoughts?
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John A. Lind |
Bill, I've never noted any difference between the two. A circular is a linear on the front end with a "quarter wave plate" added onto the back side to circularly polarize the polarized light passing through the linear in front of it. Effectiveness of either type depends on how close you are to "Brewster's Angle" which is the angle of incidence and reflection at which the surface polarizes the reflected light most. With most common window glass (uncoated) and air (Brewster's Angle depends on the index of refraction of the two) the optimum angle is about 56 degrees. Efficacy of a polarizer gradually reduces as you deviate from this angle. For air and water, the other common glare reduction situation, Brewster's Angle is a few degrees less, about 53 degrees. Notes: -- John Lind
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