The NiSi 62mm Adaptor for NiSi Close Up Lens Kit NC 58mm (Step Down 62-58mm) allows the use of the NiSi Close Up Lens Kit NC 58mm on macro lenses with 62mm filter thread including compatible for Nikon AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED and the compatible for Sony FE 90mm F2.8 Macro G OSS. It features a lightweight, aluminum-alloy construction that has a corrosion-resistant, black anodized finish for durability.When the 58mm close up lens is used with compatible for Nikon AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED and compatible for Sony FE 90mm F2.8 Macro G OSS will give an approximate 2:1 magnification ratio.The ring is a step down from 62mm to 58mm.