
Interchanging the Focusing Screen
aperture smaller than f/5.6 will cause the focusing screen’s microprism to darken.
Compatible with all EF lenses. With slow lenses whose maximum aperture is smaller than f/5.6, the 
Ec-CIII:  Laser-matte 
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 and periphery help you compose shots for 
Suited for photomicrography and astrophotography.
Ec-L:  Cross split screen
Compatible with all EF lenses. Focus with the vertical and horizontal splits. Lenses with a maximum aperture smaller than f/5.6 will cause the focusing screen’s split portion to darken.