The square filters we stock come in three different sizes, depending on the system in use. A-series filters are 67mm wide, and are suitable for standard lenses with diameters up to 62mm. P-series filters are 84mm wide, and are suitable for larger diameter lenses up to 82mm. Z-pro series filters are 100mm wide, and are designed for medium-format or wide-angle lenses up to 96mm in diameter.
The most popular choice, and the system we stock the most filters for, is the P-type system.
