Features： Specially designed replacement for Mamiya 645 lens to Fujifilm G mount cameras, like GFX100, GFX50S, GFX50R, GFX100S, etc. Both of sides can fit well with lens and camera, no gap and no wiggling, easy to install, can be easily removed when not in use. Not affect camera's normal use, automatic diaphragm (AE metering) and other auto functions still work with this adapter ring. Made from high-quality metal, precisely machined, with well-plated surface, rust-proof and durable for use. For most cameras lens, it supports infinity focus for more professional photography, making your masterpiece distinguish from others Specifications： Color: Black Material: Metal Product Size: 7.5 * 6 * 4.5cm/ 2.9 * 2.3 * 1.7inch Product Weight: 153g/ 5.3oz Note： The camera and lens showed in the pictures are not included. Package List： 1 * Adapter Ring