The 71455 Shutter, with its compact size, easily integrates into a variety of light source systems. This shutter can be operated using the toggle switch on its case or by sending a TTL signal to the BNC connector. The shutter aperture is 0.4 in [10 mm] diameter. Its thin profile allows it to fit into a tight optical path. The shutter is designed with standard 1.5-inch series flanges, so it may be coupled to a wide variety of Oriel^® accessories and instruments. The #1/4-20 threaded holes on three sides of the housing allow it to be conveniently positioned when being rod mounted. The Oriel OPS series arc lamp power supplies and quartz tungsten halogen (QTH) lamp power supplies are capable of providing a TTL signal to operate the shutter. The light intensity control feature of the OPS power supplies allows users to set up timed exposures and control the dose received by the sample. These power supplies include command sets, allowing developers to design programs that can automatically control when the shutter is open or closed. The shutter receives power to operate from a small DC power supply, which is provided. It is shipped with both U.S. and European power cords. This shutter is used with light sources up to 150W; higher power requires a liquid filter or other means of heat control.