Small Hole - Filters 60 to 68 are recommended from Standard lenses to Tele lenses. Sharpness of the hole’s edges will depend on the aperture : the smaller will be the aperture, the sharper will the hole’s edges be, and vice-versa. Density 1
For shorter focal lengths 20-24 or 28mm as well as for wide angle zooms (24-50mm / 28-85mm / 35-135mm) the Cokin P System is strongly recommended.