Abstract: A headlight warning system incorporates an engine running sensor and a headlight sensor coupled to a control circuit for activating a warning device, such as a buzzer, when the headlights have been left on for a first period of time after the engine has stopped running, and for deactivating the warning device either after a second period of time, if the engine is started, or if the headlights are shut off. The engine running sensor inductively senses a vehicle ignition signal. The headlight sensor magnetically senses the current in one of the battery cables using a Hall effect sensor in series with a magnetic flux collector encircling the battery cable. If the battery current exceeds an adjustable threshold, the headlights are assumed to be on. Following the deactivation of the warning device after the second period of time, the headlight warning system is reset by either starting the engine or by shutting off the headlights.

Abstract: The device permits swing, shift, tilt and rise-and-fall movements between a lens and a motion-picture camera to manipulate focal relations and image shapes. Preferably the device rests on rails (called "iris rods") of a balance plate or base--secured under the camera--or some other track, similarly mounted. If so, the device has a first intermediary element preferably mounted to slide fore-and-aft on the track relative to the camera; and other intermediary elements mounted in a sequence preferably from the first element for translation and rotation relative to that element--ending in a lens-board mount for mounting a lens. Also in balance-plate mounting the device preferably includes a bellows whose front end joins the lens-board mount and whose rear end holds an adapter to engage the camera lens port. Preferably the device has a yoke (preferably flat and rearward-extending) for, e.g.

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.

Abstract: A case hinges to the side of the movie camera next to the ground glass. One end of a viewfinder tube mounts pivotally to the case; the other supports an ocular. Light from the inverted image on the ground glass passes, at a right angle to the camera side, into the case. An Amici prism in the case reerects the image and reflects the light rearward to a beam splitter. The splitter passes part of the light rearward to a 45.degree./90.degree. prism and then upward through a lens and iris to a video port and neutral-density filter. The beam splitter deflects the rest of the light outward, at a right angle to the camera side, into the finder tube. There another 45.degree./90.degree. prism (that rotates with the tube) deflects the light rearward in the tube to a lens that reimages the scene at the ocular. The movie camera can thus be tilted while the tube and ocular are at constant height, but prism rotation twists the image about the optical path.