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35mm canon lens4/11/2023 The EF mount instead provides leaf springs in the receptacle, which hold the registration surfaces of the lens and receptacle together along the optical axis, while the manual twisting action engages a spring-loaded registration pin in the receptacle which drops into a recess provided on the bayonet fitting, locking the rotation. Attaching an FD lens to a camera body required two hands: one to hold the lens in position, and a second to twist the breech-lock ring to rigidly lock the lens to the camera. The EF mount also changed the logical clamping action of the bayonet receptacle to improve the tactical operation. ![]() The EF mount reverses this logic, providing the bayonet on each lens, and a receptacle on the camera body. ![]() The FD mount provided the three-eared bayonet fitting on the camera body, and each FD lens provided a breech-lock receptacle to register and fasten the lens to the bayonet. The EF mount reversed the mechanical logic of the FD mount. The motors were designed for the particular lens they were installed in. This allowed for autofocusing lenses which did not require mechanical levers in the mount mechanism, only electrical contacts to supply power and instructions to the lens motor. The key innovation of the EF series was to use a motor inside the lens itself for focusing. The standard autofocus lens mounting technology of the time used a motor in the camera body to drive the mechanics of the focus helicoid in the lens by using a transfer lever. The EF mount replaces its predecessor, the FD mount. Number of Canon EF lenses sold over time (red), compared with Nikon F mount lenses (blue)
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