Photo Filter screw which is applied in front of a lens of a camera to achieve a certain effect. Manufactured glass lens and metal ring. Macro or close-up filters are used to take macro pictures without mounting a lens or a macro lens on the camera. The macro filter is manufactured in several diopters (+1, +2, +3, etc). A diopter is a scale that measures the optical force. In ista section provides +10 diopter filters. A characteristic of close-up filters is that they can be used together, so you can create combinations adding diopter values. A macro Filter is ideal for small items such as photos, insects, flowers, coins, etc..