Optical viewfinder

摘要

An optical viewfinder is configured to be attached to a camera body with an interchangeable lens. The optical viewfinder includes: a Keplerian viewfinder optical system 301 including a scalable objective lens group 330; a stepping motor 305 configured to drive the objective lens group 330 along an optical axis; and a control circuit configured to control driving of the stepping motor 305 based on a result of detection by a PI 306. When a variable focal length lens (an interchangeable lens) is attached to a camera body, the control circuit controls driving of the stepping motor 305 in accordance with a focal length of the variable focal length lens and displays at least a photographing frame on an EVF panel 307.

主权项

1. An optical viewfinder configured to be attached to a camera body with an interchangeable lens, the optical viewfinder comprising:
a Keplerian viewfinder optical system including a scalable objective lens group; a drive source configured to drive at least one objective lens of the objective lens group along an optical axis; a detector configured to detect a position of the at least one objective lens; a control circuit configured to control driving of the drive source based on a result of detection by the detector; an electric contact configured to be electrically coupled to the camera body; a visual field frame disposed on a focal plane of the objective lens group, and wider than a photographing frame of the interchangeable lens that is to be attached to the camera body; a display device optically equivalent to the focal plane when viewed from an eyepiece lens of the camera and located at a position different from that of the visual field frame; and a communication unit configured to receive information on a focal length of the variable focal length lens through the electric contact from the camera body, wherein when a variable focal length lens is attached to the camera body as the interchangeable lens, the control circuit controls driving of the drive source to adjust a magnification of the objective lens group based on information on a focal length of the variable focal length lens received by the communication unit, and displays at least the photographing frame on the display device.