Canon focus screen EE-S

The Ee-S Super Precision focusing screen is designed for manual focusing with high-speed lenses (f/2.8 or faster). The Ee-S screen has finer microlenses than the Ee-A or Ee-D along with a steeper parabola of focus to make the image pop in and out of focus more vividly in the viewfinder. However, the Ee-S focusing screen is not recommended for slower lenses because it's not very bright.