The EOS 40D has a solid, substantial feel that complements its compact dimensions. Designed to withstand the rigors of everyday use, the EOS 40D's exterior is constructed with lightweight and ultra-rigid magnesium-alloy that fits perfectly in the hands of the photographer.
The EOS 40D is designed to perform flawlessly, again and again. It has an improved high-speed and durable shutter unit, designed to respond in an instant, reaching a top shutter speed of 1/8000 sec. and tested to a remarkable 100,000-cycle shutter life. A top flash sync speed of 1/250 sec. ensures full flash flexibility in bright or dim light.
With some lenses, the peripheral AF points may become sensitive to either vertical or horizontal lines (they will not function as cross-type AF points). These lenses are: EF 35-80mm f/4-5.6, EF 35-80mm f/4-5.6 II, EF 35-80mm f/4-5.6 III, EF 35-80mm f/4-5.6 USM, EF 35-105mm f/4.5-5.6, EF 35-105mm f/4.5-5.6 USM, EF 80-200mm f/4.5-5.6 II, EF80-200 f/4.5-5.6 USM.