Methods of Installing and Removing the Lens

The lens of the SLR camera connects with the camera body by means of bayonet, which often divides into inner three knives style and outer three knives style, and in order to prevent the lens from falling from the camera body, it often has locking tenon. The cameras made by different factories are different, and the position and operation of the locking gear is a little different, so that the stalling and removing of the lens is also different, for example, Nikon F bayonet is inner three knives style and is installed with anticlockwise rotation; Canon EF bayonet is inner three knives style and is installed with clockwise rotation. Moreover, the initial position of the locating point is also different when the lens inserts.

Why do we use the rotary bayonet? The initial renewable lens connects with the camera body on the screw, just like screw installs into the nut (like M42 screw). As the time goes, the screw cannot meet the user’s requirements, for instant, the screw cannot basically fulfill the requirements of full-aperture metering and shrinking the aperture, which is the most basic function of the bayonet SLR camera. Then, bayonet is born.

Do be careful to install the lens, and be more careful to remove the lens. Remove the lens vertically otherwise the lens will be not easy to remove, and the lens cone or the camera body bayonet will be damaged. When rotate the lens, the hand should handle the lens cone, instead of handling the aperture or the focus ring or the zoom ring.

Under the circumstance of full of dust and sand, do not change the lens as possible as you can, in case the dust and sand goes into the mirror box. If you have to change the lens in the bad situation, twist over the camera, and install and remove the lens against the bottom so that the lens can minimize the sand and dust. Maintenance of the lens is close related to the photo effect, so the shutterbug should be more careful about the lens when install and remove the lens.