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美能达３００ｓｉ和５００ｓｉ这类机种照相机均为机身自动调焦的变焦单镜头反光照相机。自动调焦的变焦镜头也像普通的单镜头反光照相机一样可以自由拆卸，其自动调焦的信息是通过机械的万向节传递到镜头的，使用十分方便。但这类照相机在操作中必须非常小心，不明白使用方法?
Minolta 300si and 500si this type of camera are the body autofocus zoom single-lens reflex camera. Autofocus zoom lens is also the same as a normal single-lens reflex camera can be freely disassembled, the autofocus of the information is passed through the mechanical universal joints to the lens, the use of very convenient. However, this type of camera must be very careful in operation and do not understand how to use it.