Ef SERIES (EOS 40D, 50D, 60D):
-Ef-A Standard Laser Matte focusing screen.
-Ef-D Precision Matte surface with etched grid lines.The camera’s AF points remain fully visible.Focus characteristics are suited to mostlenses.
-Ef-S The Super Precision Matte focusing screen isoptimized for wide-aperture lenses from f/1.8thru f/2.8. Areas that are slightly out of focusappear more out of focus, making it easier totell when focus is right-on. It is ideal for userswho frequently use manual focus in dim lightwith fast lenses.
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