Abstract: A temperature compensating focuser and method for use, with a telescope includes providing a temperature sensor adapted to measuring temperature at the telescope body, a lens support for one of the focus optics and a control. The control includes a motor adjusting the support to modify a distance between the focus optics of the telescope in response to changes in temperature sensed by the temperature sensor. The control may further include a learning mode for establishing a temperature coefficient of the telescope. The control may further include a memory for storing a relative position of the lens support and a temperature value when power is removed from the control. The control adjusts the lens support according to the relative position and temperature values in memory and temperature sensed by the temperature sensor when power is restored to the control.

Abstract: A remote control system for controlling the azimuth and altitude of a searchlight and also a control for selecting one of two modes of operation, either spot or flood, of the searchlight. The system includes a dual remote control of the spotlight, for use in vehicles, such as boats, where it is desired to control the direction of the spotlight and mode of operation from two separate locations. The system includes means for locking out one remote control position when the other remote control system is actuated.