Abstract: A lens barrel is provided with an adjustment mechanism and the adjustment mechanism has a fixed side hole part, a cam-side hole par, a driving transmission part that is provided on the outer peripheral side of a movable lens holding frame in the same straight line as the fixed side hole part and the cam-side hole part in a state where these hole parts are aligned, an inner peripheral engagement part that is formed on an inner peripheral surface of a fixed lens holding frame, and an outer peripheral engagement part that is formed on an outer peripheral surface of the movable lens holding frame in a state of engaging with the inner peripheral engagement part, and moves the movable lens holding frame in an optical axis direction by rotating with respect to the inner peripheral engagement part.

Abstract: A lens holder holds a plurality of lenses aligned in a direction of an optical axis. This lens holder is at least partially assembled from subunits divided on a plane that includes the optical axis. In a connecting shell that connects a first shell and a second shell and holds an optical element for bending an optical path, an optical path of only one subunit is effectively used. The connecting shell includes a first connecting structure for connecting to the first shell and second connecting structures for connecting to the second shell, the second connecting structures being disposed at two symmetrical positions around the first optical axis.

Abstract: A lens holder holds a plurality of lenses aligned in a direction of an optical axis. This lens holder is at least partially assembled from subunits divided on a plane that includes the optical axis. In a connecting shell that connects a first shell and a second shell and holds an optical element for bending an optical path, an optical path of only one subunit is effectively used. The connecting shell includes a first connecting structure for connecting to the first shell and second connecting structures for connecting to the second shell, the second connecting structures being disposed at two symmetrical positions around the first optical axis.

Abstract: A camera having a finder, capable of photographing a first size and a second size, comprises a field frame for the first size, which is provided in front of an eye piece of said finder, and a field frame plate for the second size, which is provided in a manner to be movable between an objective lens and the eye piece of said finder and is formed with display portions for displaying portions other than a field frame and shielding portions. A field frame plate change-over mechanism retracts the field frame plate for the second size out of the optical path of the finder during the photographing of the first size, and disposes the field frame for the second size in the optical path of the finder between the objective lens and the eye piece during the photographing of the second size. This field frame plate shields the field frame for the first size by shielding portions of the field frame plate for the second size.