This is a set of lens side adapter for HT2/3 100mm holder filter diameters 67mm/72mm/77mm. When shooting with multiple lenses, you can quickly change the holder without having to replace the adapter every time. Works with either HT3/HT2 type.
There are no screws on the outer side of the screw, so you cannot install a filter or lens cap. Please use the special adapter ring cap C100 for the cap.