Canon Drop-In Screw Filter Holder 52 (WIII) with Protect Filter
Canon Drop-In Clear Filter
Compatible Lenses
EF 400mm f/2.8L IS III USM
EF 600mm f/4L IS III USM
RF 400mm f/2.8 L IS USM
RF 600mm f/4 L IS USM
RF 800mm f/5.6 L IS USM
RF 1200mm f/8 L IS USM