Best Circular Polarizer for Tamron 150-500mm f/5-6.7

The Tamron 150-500mm f/5-6.7 is a beast for wildlife and sports, but shooting through atmospheric haze or off-water reflections often results in flat, washed-out images. Adding a high-quality 82mm circular polarizer is the quickest way to reclaim that lost contrast and saturation. Having tested dozens of filters on long telephotos, I’ve found that the B+W…