Mounts EF in 1987 by Canon Inc introduced. This mounts the same, is something that the company is in cameras full-frame category top of herself, such as D Mark IV5 and D Mark II6 advantage of it. Each EF lens has a motor, auto focusing is internal and don't have this two, letter stands for Electro-Focus, meaning the Focus Electric. You products Canon lens with this mount, and without the ability to auto-focus domestic find never miss. But this thread is about the company, the third party applies not and some products and then for the mounts, EF of manual focus benefit. If the lens you see that for Canon camera supplied and details of certain of the Prudential offer? can almost be sure that it was the lens for mounts, EF is designed.

Mount EF-M by Canon for use in Series mirrorless cameras, the company, such as M100 is designed. These lenses just and just on the mounts, EF-M usable they will be. If you desire to use EF lenses or EF-S, TAKE NOTE, You can use the adapters for it on Mount EF-M install.