Canon EOS-3 Instructions Manual page 107

Setting for focusing screen Ec-N or Ec-R (
Setting for focusing screens Ec-A, Ec-B, Ec-C, Ec-CII, Ec-D, Ec-H, Ec-I,
Ec-L ( : Lasermatte Screen)
L
Settings 1 and 3 are ideal when film rewind noise would be disturbing.
Focusing Screen
Remarks
: New Lasermatte Screen).
N
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