Brand: Canon, Type: Focusing Screen, Product Weight: 0.0100, Compatible with Canon D2000, 1D, 1D Mk II, 1D Mk II N, 1D Mk III, 1D Mk IV, 1Ds, 1Ds Mk II, 1Ds Mk III, and 1Dx, Warranty: 01 Year Limited Warranty. The Ec series New Laser Matte Ec-N Interchangeable Focusing Screen from Canon is for general photography and has a Bright Laser Matte field with an AF ellipse center-focusing spot. It can be used in select Canon cameras, and works with most lenses.