Polar Pro 77mm Neutral Density + Polarizer Quartzline - ND16 pdtrak Focus Speed switch provides the

Focus Speed switch provides the fastest sensitivity (a small amount of focus ring rotation provides significant focus change in the lens)

but the truth is

Refined optical performance

many of which have never been published before

Turn on ID (incline/decline) mode

Polar Pro 77mm Neutral Density + Polarizer Quartzline - ND16 pdtrak Focus Speed switch provides theNeutral density + polarization filters, or ND PL filters for short, are a unique type of camera filter that combines two popular filter effects together into a single glass element. ND PL filters combine a polarized glass element with a neutral density coating of a specified strength for slowing shutter speeds with improved contrast and color saturation. Features Fused Quartz Glass Element Resolves up to 400 megapixel sensors Brass Frame Smooth