What are the types of SLR lens bayonet and can it be used universally?

Different brands of SLR lens bayonet are different and not universal.

Take three common SLR brands as examples:

1, Canon EF bayonet

2. Ni Daokang F bayonet

3, Sony a bayonet

It can be seen that different brands of bayonet, contact position, aperture, notch position are different, so the lens can not be universal.

In addition, the focus of different brands of lenses is designed for the flange distance of the brand, and even if it is installed, it cannot be focused.

Of course, there are adapter rings for sale at present, which can make different brands of lens bayonet compatible with each other, but it will also bring problems of focal length, aperture and focusing accuracy. Some adapter rings can only support manual focusing.

Extended data

Basic knowledge of SLR lens

It basically includes lens properties, focal length parameters, aperture parameters, characteristics and other information.

1, lens attribute: usually indicates whether the lens is an AF mount or an EF mount, and usually includes some lens category identification.

2. Focal length parameter: indicates the focal length range of the lens, in millimeters. ..

3. Aperture parameter: indicates the maximum aperture coefficient of the lens, and some lenses also indicate the minimum aperture coefficient of the lens.