초록 ▼

A camera having an auto-focus device includes a circuit for compensating the aperture value in response to changes of the zoom lens. A focus detection circuit detects the focus condition of first and second objects in the field of view. An aperture calculation circuit determines a signal correspondi

A camera having an auto-focus device includes a circuit for compensating the aperture value in response to changes of the zoom lens. A focus detection circuit detects the focus condition of first and second objects in the field of view. An aperture calculation circuit determines a signal corresponding to a difference between the in-focus position of the lens to the first object and the in-focus position of the lens to the second object. The aperture value is determined when both objects fall within the depth of field on the basis of the difference signal. The compensation circuit compensates the aperture value in response to the change of the zoom lens. The compensated aperture value is determined so that the first and second objects are both within the depth of field of the changed zoom state.

대표청구항 ▼

A camera having an auto-focussing device, comprising: (a) a focus detection circuit for detecting a state of focus; (b) an aperture calculation circuit which determines a signal corresponding to an amount of defocus between a first in-focus position at which a first object is focussed and a second i

A camera having an auto-focussing device, comprising: (a) a focus detection circuit for detecting a state of focus; (b) an aperture calculation circuit which determines a signal corresponding to an amount of defocus between a first in-focus position at which a first object is focussed and a second in-focus position at which a second object is focussed and determines an aperture value at which both said objects fall within a depth of field on the basis of a signal corresponding to said amount of defocus; (c) a compensation circuit for detecting information on the focal length of a zoom lens and compensating an aperture value determined by said aperture calculation circuit on the basis of said information on the focal length, said compensation circuit compensating the aperture value on the basis of said information on the focal length in accordance with a lens zooming state which is changed in such a manner that said objects fall within a depth of field which is changed in correspondence with a change in the depth of field at the time when the zooming state has been changed after the calculation of the aperture value on the basis of said signal corresponding to said amount of defocus.