The Canon Ec-S Focusing Screen with Canon's exclusive Super Precision Matte technology makes it easy for professional photographers to determine the precise point of sharpest focus during manual focusing. This is because the microlens on the screen's matte is optimally shaped to increase defocusing near the point of focus.

Compatibility

-- EOS 1D Mark II N
-- EOS-1D Mark III
-- EOS-1D Mark IV Body
-- EOS-1D Mark IV Body Refurbished
-- EOS-1Ds MARK II
-- EOS-1Ds Mark III