B00DJM4FAM C-PL (Circular Polarizer) Multicoated | Multithreaded Glass Filter (95mm) for Sigma 50-500mm f/4.5-6.3 APO DG OS HSM + Nw Direct Microfiber Cleaning Cloth.

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Between 2.3 and 2.8 (approx. +1.3 stops)
Rugged Metal Filter Ring (Black Finish) | Heat Treated Glass
Slim Design Minimizes Vignetting
Multicoated Designed For Video Or Photography | Multithreaded For Mouning Lenses Or Filters On Top