This Beseler Topcon D1 model has a behind the lens metering system with cadmium sulfide lines etched in the reflex mirror, a design which tested more accurate than any other. Its metal plane shutter operates at Bulb and 1 to 1/1000th of a second with X sync up to 1/125th, and syncs with flash bulbs at all shutter speeds. The button shutter release accepts a PC cable release and has a delayed timer. The D1 accepts both Topcon auto diaphragm metering linked lenses and vintage Exacta lenses. Click on the "more ads by this user" link on the right of this screen to see my other listings, including a wide variety of Exacta mount lenses available as separate optional purchases. DISCLAIMER: The camera body has an extremely minor ding on the front corner next to the wind lever, which does not affect its performance in any way. Otherwise, this camera appears to be in excellent condition, but is sold as-is, no returns, so pickup and inspection in Tucson, Arizona, is preferred. Out of town buyers email with any questions and for payment and shipping options.