Polaroid Studio Series 77mm Lens Hood With Exclusive Pushbutton Mounting System - no more 'screwing around" With Old Fashioned Threaded Hoods Patented Push Button Mounting System Can Be Used With Virtually Any Threaded Filter Or Lens Barrel Unique Scalloped Design Prevents Lens Flare While Protecting Lens And Improving Contrast & Image Quality 11 Year Limited Warranty