77MM Altura Photo Neutral Density Professional Photography Filter Set (ND2 ND4 ND8). Includes: Altura Photo 77MM Neutral Density Professional Photography Filter Set (ND2, ND4, ND8) + MagicFiber Microfiber Lens Cleaning Cloth Reduces the amount of light that passes through the lens by 1, 2, 3-Stops. Allows for reduced shutter speeds, and wider apertures in bright light. Compatible with the CANON 70-200mm f/2.8L IS II USM, 10-22mm f/3.5-4.5 USM, 24-105mm f/4 L IS USM, 16-35mm f/4L IS USM Lenses, EF 100-400mm f/4.5-5.6L IS II USM Lens NOTE: This Altura Photo filter set is compatible with all 77mm lenses. Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by a "" (diameter) symbol. For example: 77 = 77mm lens thread size. Backed with Digital Goja 90-Day 100% Satisfaction Guarantee.