iFCL Metering with 63-Zone Dual-Layer Metering Sensor The EOS 7D features a new, 63-zone dual-layer sensor designed to complement the 19-point AF system. By taking into account the color and luminosity surrounding chosen AF points, this new system delivers an entirely new level of accuracy for better results even in difficult lighting situations. Since the metering sensor has a color measurement function, exposure errors and focus errors caused by different light sources are minimized; the EOS 7D gives stable exposure from shot to shot in situations where light changes, such as in a theater or concert hall. This makes the EOS 7D ideal for scenes with extreme difference in brightness such as brightly lit scenes or backlit scenes; the camera balances exposure of the main subject at the background, and exposures are not overly influenced by bright areas in the shot. Rugged, Durable, Dust and Weather Resistant Construction The EOS 7D is constructed of the highest quality materials, to exacting standards to ensure unfettered performance at all times. For example, the shutter can shoot at speeds up to 1/8000 sec for 150,000 cycles; the chassis is built of lightweight and rigid magnesium, and the camera"s seals are built to resist water and dust.