NiSi Close Up Lens Kit 49mm (High Magnification) The Close-up lens is constructed from three optical corrective glass, all with apochromatic design and muti-nano coating. This enables advanced resolution, natural color with almost no purple/green fringing both within focus and in bokeh. The magnification will be 1:1 at a focal length of 110mm for full framecameras. (The magnification will be 1.5X for APS-C and 2X for 4/3 cameras) Lens compatibility: 1. Suitable for lenses with a 40.5-67mm filter thread. (Adapter rings required)2. No vignetting at focal length 25mm on APS-C cameras.(Tested with Canon R7+ RF-S18-45mm F4.5-6.3 IS STM@F5)3. No vignetting at focal length 70mm on APS-C cameras.(Tested with Sony a6600+Tamron 28-200mm F2.8~5.6@F4)4. No vignetting at focal length 180mm on Full Frame cameras.(Tested with Sony A7R3+Tamron 28-200mm F2.8~5.6@F5.6) 5. Compatible with the following lenses using an adapter to achieve 2X magnifi-cation: Canon 100mm macro lens, Nikon 105mm macro lens, Sony 90 macro lens. Tips: 1. The best working distance is from 2-14 cm. Move the camera appropriately to achieve a focused image.2. We recommend using a tripod and NiSi’s macro focusing rail to achieve the most accurate focal point.3. NiSi close-up lens does not affect exposure. If capturing images by hand, we would recommend using a small aperture combined with an external flash unit or higher iso setting.4. When using the close-up lens on longer focal length lenses, the magnification is increased. Bokeh can be achieved if the close-up lens is used with a wider aperture.5. When you using the close-up lens, the best focal length depends on the lens you are using. The magnification will also differ based on the differing design of each specific lens.6. We recommend to use the NiSi macro focusing rail if you choose to shoot a focus stack series of images. Packaging includes: NiSi Close Up Lens 49mm NiSi Adapterring 67-49mm (for Canon 100mm Macro Lens) NiSi Adapterring 62-49mm (for Sony 90mm Macro Lens and Nikon 105mm Macro Lens) Protective case