The EOS 5D has a solid and substantial feel that complements its compact dimensions. The camera body is constructed of a magnesium-alloy known for its lightweight and ultra-rigid strength. The EOS 5D also boasts a newly developed, high-speed and durable shutter unit that was designed to meet the demanding requirements of a full frame sensor in a relatively compact body. With a top shutter speed of 1/8000 sec. and with a remarkable 100,000-cycle shutter life, it truly is a camera built to professional standards.