The phot r p series filter holder allows you to attach up to 3 p series filters to your camera lens the holder can be attached to all lenses no matter the size thanks to our phot r adapter rings which are available in sizes 49mm 82mm all you have to do is attach the holder to your lens with the adapter rings and then slide in any 3 filters into the holderallows you to attach up to 3 p series filters to your camera lensthe holder can be attached to all lenses no matter the size thanks to o