For Canon EOS 1D/MkII/MkIIN/MkIII and 1Ds/MkII/MkIII digital SLR cameras, the Ec-B Focusing Screen (New Split) features a matte field with split-image focusing spot in the centre.
It is used for general photography with all lenses.
A double echelette prevents blurring of the split, even when using lenses slower than F/5.
6.