Canon EF 400mm f/4 DO IS USM Instructions Manual - Page 22
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17. Extension Tubes
(Sold Separately)
You can attach extension tube EF12 II or EF25
II for magnified shots. The shooting distance and
magnification are shown below.
Focusing Distance Range (mm)
Close distance Long distance Close distance Long distance
EF12 II
2753
13407
EF25 II
2362
MF mode is recommended for accurate focusing.
Magnification (×)
0.17
6638
0.22
0.03
0.07
ENG-21