In a focus adjustment method for an imaging apparatus, that, in order to focus on a single or a plurality of point light sources, acquires plurality of image data while moving a focus lens in an optical axis direction and carries out focus adjustment based on the image data, brightness values of pixels within a given evaluation region are detected based on the image data, high brightness evaluation values are calculated based on the brightness values, symmetry of the high brightness evaluation values are calculated for movement of the focus lens, and focus adjustment is carried out based on an extreme value calculated based on the symmetry.

In a focus adjustment method for an imaging apparatus, that, in order to focus on a single or a plurality of point light sources, acquires plurality of image data while moving a focus lens in an optical axis direction and carries out focus adjustment based on the image data, brightness values of pixels within a given evaluation region are detected based on the image data, high brightness evaluation values are calculated based on the brightness values, symmetry of the high brightness evaluation values are calculated for movement of the focus lens, and focus adjustment is carried out based on an extreme value calculated based on the symmetry.

An imaging apparatus includes a photometric lens for forming a secondary image of object light that has been transmitted through a lens unit and had a primary image formed by the lens unit, a photometric sensor for outputting a signal of the object light that has had the secondary image formed, and a PN liquid crystal panel located in the vicinity of a primary imaging plane. The imaging apparatus generates an image obtained by subjecting an output signal of the photometric sensor to reforming processing on the basis of an output signal of the photometric sensor when the PN liquid crystal panel serves as an object. Thus, the imaging apparatus can suppress a deterioration in the image that could be caused by various factors including a manufacturing error, a change over time, a change in temperature, and a change in humidity.

An imaging apparatus includes a photometric lens for forming a secondary image of object light that has been transmitted through a lens unit and had a primary image formed by the lens unit, a photometric sensor for outputting a signal of the object light that has had the secondary image formed, and a PN liquid crystal panel located in the vicinity of a primary imaging plane. The imaging apparatus generates an image obtained by subjecting an output signal of the photometric sensor to reforming processing on the basis of an output signal of the photometric sensor when the PN liquid crystal panel serves as an object. Thus, the imaging apparatus can suppress a deterioration in the image that could be caused by various factors including a manufacturing error, a change over time, a change in temperature, and a change in humidity.

There is provided a camera apparatus including: a display signal generation unit that generates an index display signal for displaying an index indicative of a current focal position based on focal position information; and a combination unit that acquires an image signal for a viewfinder by combining a captured image signal with the index display signal.

There is provided a camera apparatus including: a display signal generation unit that generates an index display signal for displaying an index indicative of a current focal position based on focal position information; and a combination unit that acquires an image signal for a viewfinder by combining a captured image signal with the index display signal.

An ocular lens consists of a positive first lens group, a positive or negative second lens group, and a positive third lens group, in order from an observation object side. The first lens group consists of a positive meniscus lens with a convex surface toward an eye-point side. The second lens group includes a negative lens and a positive lens, and the number of lenses constituting the second lens group is three or less. The third lens group consists of a positive meniscus lens with a convex surface toward the eye-point side. The following conditional expression relating to a focal length of the whole system and a distance on an optical axis from a lens surface closest to the observation object side to a lens surface closest to the eye-point side is satisfied: 0.8<f/TL<1.1.

An ocular lens consists of a positive first lens group, a positive or negative second lens group, and a positive third lens group, in order from an observation object side. The first lens group consists of a positive meniscus lens with a convex surface toward an eye-point side. The second lens group includes a negative lens and a positive lens, and the number of lenses constituting the second lens group is three or less. The third lens group consists of a positive meniscus lens with a convex surface toward the eye-point side. The following conditional expression relating to a focal length of the whole system and a distance on an optical axis from a lens surface closest to the observation object side to a lens surface closest to the eye-point side is satisfied: 0.8<f/TL<1.1.

A lens apparatus includes a focus lens, a focus detector, an automatic focusing unit configured to drive the focus lens based on a focus detection result obtained from the focus detector, a focus information output unit configured to output focus information to a display unit capable of displaying the focus information superimposed on a picked up image obtained by picking up an image with use of a light beam from an object, which passes through the lens apparatus, and a display determination unit configured to determine whether or not to display the focus information on the display unit, in which the focus information output unit is configured to output a signal for displaying the focus information to the display unit based on a determination result obtained from the display determination unit.

A lens apparatus includes a focus lens, a focus detector, an automatic focusing unit configured to drive the focus lens based on a focus detection result obtained from the focus detector, a focus information output unit configured to output focus information to a display unit capable of displaying the focus information superimposed on a picked up image obtained by picking up an image with use of a light beam from an object, which passes through the lens apparatus, and a display determination unit configured to determine whether or not to display the focus information on the display unit, in which the focus information output unit is configured to output a signal for displaying the focus information to the display unit based on a determination result obtained from the display determination unit.