Canon EOS-1V HS Instructions Manual page 128

Interchanging the Focusing Screen
Ec-series Interchangeable Focusing Screens
Ec-A: Standard microprism
Ec-B: New split screen
Ec-CII: All Laser-matte
Ec-CIII: Laser-matte
Ec-D: Laser-matte with grid
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Compatible with all
EF lenses. Lenses
with a maximum
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 split-image circle
may darken.
EOS-1N's standard
focusing screen.
EOS-1 V's standard
focusing screen. The
CIII logo is imprinted
on the lug to
distinguish it from
the Ec-N.
Compatible with all
EF lenses. Ideal for
architectural
photography and
photo duplication
work.
Ec-H: Laser-matte with scale
Ec-I: Laser-matte with cross hair reticle
Ec-L: Cross split screen
Ec-N: New Laser-matte
Ec-R: New Laser-matte
Compatible with all
EF lenses. The
scales at the center
and periphery help
you compose shots
for close-ups and
photomicrography.
Use the cross hair at
the center to focus.
Suited for
photomicrography
and
astrophotography.
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.
EOS-3's standard
focusing screen.
EOS-1N RS's
standard focusing
screen.