Changeable lens, camera, and camera system

Abstract

The invention provides a changeable lens, a camera, and a camera system, which are capable of conducting micro adjustment of a focus nearby a focusing position with good operability and conducting drive control of the focusing lens in high precision. The camera system is composed of the changeable lens and a camera main body on which the changeable lens can be mounted. The changeable lens comprises a first focusing lens group having a first image surface movement quantity relative to a unit drive quantity; a second focusing lens group having a second image surface movement quantity relative to the unit drive quantity and smaller than the first image surface movement quantity; and a lens drive controlling part used for selecting the first focusing lens group or the second focusing lens group according to an instruction from the camera main body when an MF operation part is operated under the state that the changeable lens is installed on the camera main body, and for conducting drive control of the selected first focusing lens group or the selected second focusing lens group according to operations of the MF operation part.

Description

technical field [0001] The present invention relates to a camera system composed of a photographic lens and a camera body to which the photographic lens can be attached, an interchangeable lens that can be attached to the camera body, and a camera. Background technique [0002] In recent years, the advancement of imaging equipment has been remarkable. Especially in the field of cameras, digitalization has been carried out by replacing the silver salt film that takes images with imaging elements, and gradually replacing the conventional optical viewfinders with liquid crystal panels or organic viewfinders. EL etc. display monitor or electronic viewfinder (EVF). [0003] However, in the case of the above-mentioned display monitor or EVF, when there are all subject images that can be displayed on the imaging element, and when shooting at night, etc., the display light amount can be adjusted so that the composition in the shooting screen can be easily visually confirmed. On the...

AI Technical Summary

Problems solved by technology

[0003] However, in the case of the above-mentioned display monitor or EVF, when there are all subject images that can be displayed on the imaging element, and when shooting at night, etc., the display light intensity can be adjusted so that the composition in the shooting screen can be easily visually confirmed. On the other hand, there are disadvantages such as the following: Compared with optical viewfinders mounted on single-lens reflex cameras, it is difficult to know the subtle changes in focus, so it is difficult to perform manual focus (MF) with high precision. Disadvantages of focusing

[0009] However, in the schemes disclosed in the above-mentioned Patent Document 1 and Patent Document 2, when the displayed image is enlarged during MF operation, since the drive control method of the focus lens is the same as that of the non-magnified case, it is easy to confirm the focus state. When the sensitivity of the image plane change to the movement of the focus lens is high, it is difficult to perform fine focus adjustment near the focus position.

[0010] In addition, in a lens structure using a focus lens that prioritizes operability when performing fine focus adjustments and has low image plane change sensitivity, when the amount of defocus is large, it takes time to move the focus lens to the vicinity of the focus position. The problem

[0011] In addition, when performing autofocus (AF) with a photographic lens that has to use a focus lens with high sensitivity to image plane changes as described above, it is difficult to control the drive of the focus lens near the focus position as in the case of MF operation. High, there are problems such as it is difficult to perform high-precision AF control, and the AF control time becomes longer

Images