| 摘要 |
A camera assembly, preferably a cinematographic camera assembly, comprises a camera housing and a plurality of interchangeable lenses which can be attached to the camera housing for capturing an image. Each lens has a body and a lens system comprising at least one lens element that is movable relative to the lens body to alter the focus distance of the lens, the lens having a focal length that differs from the focal length of the each other lenses. Each lens has a focus scale on one of the lens system and the lens body that comprises a plurality of focus distance marks, and a focus index mark on the other of the lens system and the lens body, so that the lens can be focused at a desired focus distance by relative movement of the focus scale and the focus index mark to align the focus index mark with the focus distance mark on the focus scale corresponding to the desired focus distance. The focus scale extends between a position corresponding to a far focus distance and a position corresponding to a close focus distance, and is divided into at least two sub-ranges that adjoin at a position corresponding to an intermediate focus distance. One of the sub-ranges is a principal sub- range in which the relative position of the focus scale and the focus index mark that is required to focus the lens at any focus distance within the principal sub-range is substantially the same for at least two lenses. This improves the ergonomics of the system since the same manual or mechanical operation will be required to focus all the lenses in the assembly when focusing in the principal sub-range. Preferably the focus scale is linear in the principal sub-range so that the travel of any lens elements will be proportional to the rotation of the lens ring. |
