Camera system and focus information display apparatus

摘要

A focus evaluation value used for contrast-determination autofocus (AF) and a focus position at the time of determination of the focus evaluation value are enabled to be outputted to a peripheral device such as a personal computer. This enables an operator to readily obtain information on the focus evaluation value from the peripheral device in a case such as an AF malfunction and thereby referring to the information to elucidate the cause of the AF malfunction. Furthermore, for determination of correct focusing in a tracking adjustment of a shooting lens, the relative magnitude of the focus signal continuously obtained according to video signals of a camera is displayed as a graph on a monitor, and the size of the graph is changed according to a maximum focus signal value obtained. Therefore, the graph can be displayed in an appropriate size on the monitor irrespective of variances of the magnitude of the focus signal due to different objects of shooting. This enables determination of correct focusing and a focus adjustment with accuracy and ease.