The NiSi Close Up Lens Kit NC 58mm (with 49 and 52mm adaptors) allows lens between 24-250mm (APS-C) and 35-250mm (Full Frame) to function as a macro lens. It’s compatible also with zoom lenses. You can also use it together with macro-lenses with over 50mm focal length.The close-up lens is the most effective way to achieve a closer minimal focal distance. The magnification of this close up lens is +5 diopters. The magnification will be 1:1 at a focal length of 120mm (Full Frame).To use a close-up lens it is important to know the maximal and minimal distances at which you can focus because you will only be able to take a properly focused image within that range. The working distance depends on which lens you are using, but will be between 9-22cm. We recommend using the close-up lens with an aperture of f/8-f/16 to achieve the sharped details. NiSi’s Close-up lens is made of double optical corrective glasses with apochromatic design and muti-nano coating to give advanced resolution and a natural color with almost no purple/green fringing both within focus and in bokeh. Mounts on any lens with a 58mm thread with a focal length of 24 to 250mm. Note! Can be used with NiSi Step Down Adapterring 62-58mm, to fit macro-lenses like Sony 90mm and Nikon 105mm without vinjetting. Can be used with NiSi Step Down Adapterring 67-58mm, to fit macro-lens like Canon 100mm without vinjetting. Includes: Close Up Lens (58mm) 49mm and 52mm adaptors Lens Cap Pouch Features Dual lens elements of high quality optical glass Apochromatic correction Double optical corrective glass Muti-nano Coating Available for lenses with 58mm filterthread Magnification Diopters +5 58 mm filter thread, included adapters for 49 and 52 mm