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Lens Rentals test shows all circular polarizing filters work great, price doesn't matter: Digital Photography Review
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Amazon.com : Digital Multi-Coated Circular Polarizer Filter (CPL - 49mm) Compatible for Sony 50mm f/1.8 (E Mount) : Electronics
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Magic of the Irix Edge Circular Polarizer filter! - Irix lenses were designed with both the effort and experience, of not only engineers, but also photographers. Swiss precision and Korean innovation create
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