Abstract: The lens barrel includes a first planar portion, a barrier front cover, a vane portion, and a lens group frame. The first planar portion is configured to be substantially perpendicular to an optical axis and includes a first opening portion. The barrier front cover includes a second opening portion. The vane portion is configured to move between a first position and a second position. The vane portion is configured to cover the first opening portion and the second opening portion at the first position, and allow the first opening portion and the second opening portion to open at the second position. The lens group frame is configured to support rotatably the vane portion and includes at least one lens. The first planar portion is disposed closer to a subject than the barrier front cover. The first opening portion is formed smaller than the second opening portion.

Abstract: A projector includes a casing, a light source disposed in the casing and capable of providing an illumination beam, a light valve disposed in the casing and capable of converting the illumination beam into an image beam, a lens disposed in the casing and adapted to project the image beam, and the lens collar module. The lens collar module includes a fitting part and a lens collar. The fitting part is formed on the casing, and has a fitting opening and a first bump. The lens collar has a fitting periphery and a second bump. The fitting periphery is fitted to the fitting opening, the lens collar is adapted to be rotated and translated relative to the casing along an axial direction. Engagement of the first bump and the second bump limits rotation and translation of the lens collar relative to the casing along the axial direction.

Abstract: A combination of camera bodies and detachable lenses including a lens-side and body-side bayonet mounting structure on two format types of lens and camera bodies to allow the mounting of a larger format lens to a smaller format body, and to preclude the mounting of a smaller format lens to a larger format body. The body-side mounts have mounting gaps of predetermined sizes, and the lens-side mounts have mounting members of predetermined sizes to fit in the mounting gaps. The larger format lens-side mounting member is sized to fit into both smaller and larger format mounting gaps, and the smaller lens-side mounting member is sized to fit into only the smaller format mounting gap. Common reference surfaces are provided to all of the mounts to position the lens in the radial and axial directions.

Abstract: This adapter is interchangeable with standard nondamping lens-mounting adapters. It reduces the amount of vibration that is transmitted from the camera mechanism to the lens. It thereby reduces the amount of vibration that is retransmitted as objectionable background sound, by radiation from the lens, into a sound stage or other scene area. A vibration-absorbing resilient ring is securely fixed to two substantially rigid rings. A camera mount is secured to one of the rigid rings, for mounting to a camera in a normal position for mounting a standard adapter. A lens attachment is secured to the other rigid ring, for attachment to a lens in a normal position (on the lens) for attaching a standard adapter. The camera mount and the lens attachment both have respective standard-configuration portions, which are spaced apart by a distance that is precisely equal to a standard distance between the respective corresponding portions of a standard adapter.