Today, while at the
Corpus Christi Hawk Watch, I tested a
ProMaster 77mm CPL Digital HD circular polarizer filter with a
Canon EF 100-400mm f/4.5-5.6L IS USM lens. The results were a disaster. With the camera on a stable base and in bright sunlight, I took images at 400mm of a store sign. With the filter attached, the best auto focus achievable gives the effect of motion blur.
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| Canon EF 100-400mm f/4.5-5.6L IS USM, no circular polarizer |
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| Canon EF 100-400mm f/4.5-5.6L IS USM, with ProMaster 77mm Digital HD CPL circular polarizer |
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