These close up filters simply screw onto the front of any 37mm lens, and will maintain resolution and picture clarity while magnifying image size. The optical magnifying lenses are diopters for close up photography, which shorten the close focusing distance of the lens. It allows the lens to go closer to the subject than before and to achieve a larger image scale. Ideal for photographing small items and focusing in on details of coins, flowers, jewelry and , as well as industrial photos of miniaturized components other scientific photography. Lenses can be used individually or in combination for maximum effect.(E.g. +1 2 to make a +3 effect or + +2 to make a +6 effect.) Specification: Size: 37mm Magnification: +1, +2, +4, +10 Pouch Size (L x W ): 47 X 8.8cm Package Includes: 1 Piece 37mm +1 Close Up Filter 1 Piece 37mm +2 Close Up Filter 1 Piece 37mm +4 Close Up Filter 1 Piece 37mm +10 Close Up Filter 1 Piece Filter Bag