this close up macro lens kit include the +1 / +2 / +4 / +10 close up lens. The high quality optical magnifying lenses are diopters for close up photography. which will short 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. lens can be used individually or in combination for maximum effect. eg: +1 & + 2 make a + 3 effect.