A simple way to use filters in conjunction with select Canon super-telephoto lenses, the Drop-In Screw Filter Holder 52 (WIII) accepts 52mm screw-in filters and the holder fits into the rear of compatible lenses for easy access and use. Included with the holder is a 52mm Protect clear filter.
★★★★★ Perfect solution for using 52mm filters on my Canon super-telephoto. The drop-in holder fits securely in the rear and makes filter changes quick and easy. The included Protect filter is a nice bonus.