Melles Griot solenoid drive, spring return shutters offer high performance in a range of operating conditions. Shutters come in 25, 35, 43 and 64 mm aperture sizes and can operate at 3, 6 or 12 volts. Shutters can be normally open or normally closed. The 25mm Extreme Service shutters are used in appplications with extreme temperatures and transportation shock. High speed IES and Ultra Thin shutters are commonly used in scientific imaging applications and laboratory research.