Patent ID: 8922701

Claim:
An auxiliary focusing system for a camera, comprising: a processor; and a storage unit connected to the processor, and storing a plurality of programs to be executed by the processor, wherein the storage unit stores: a definition calculating module to calculate definitions of each image of a plurality of images during a focus length of the camera being adjusted from a minimum focal length to a maximum focal length for obtaining a plurality of first definitions, and to calculate a definition of one of the plurality of images when the camera is adjusted for obtaining a second definition; a storing module to store the first definitions and the second definition; a comparison module to compare the first definitions stored in the storing module to obtain a greatest definition in the first definitions, wherein the comparison module further compares the second definition with the greatest definition, when the second definition is less than the greatest definition, the comparison module outputs a first informing signal, when the second definition is equal to the greatest definition, the comparison module outputs a second informing signal; and an informing module to inform that the camera needs to be adjusted in response to receiving the first informing signal, and to inform that the camera needs not be adjusted in response to receiving the second informing signal.