How to distinguish between automatic aperture lens and manual?

The method of identification is simple. See if there is a metal electric shock at the lens mount. If there is electric shock, it is automatic aperture, and if there is no electric shock, it is manual aperture.

In the development of automatic lens, the earliest electronic shock is the electric shock of automatic aperture, and then with the development of autofocus and anti-shake technology, there are many electric shocks with various functions. There are many electric shocks in a fully automatic lens mount, but in the early stage of automatic lens, there are usually only one or two electric shocks, and this kind of electric shock is the electric shock of automatic aperture.

There is also a judgment that a lens without an aperture ring must be an automatic aperture lens (except Kodak DKL lens, Kodak DKL mouth lens, the aperture is adjusted on the fuselage, and there is no aperture ring on the lens).