Canon EF 400mm f2.8L IS II USM - Manual (Page 21)

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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.
EF300mm f/2.8L IS II USM
EF400mm f/2.8L IS II USM
MF mode is recommended for accurate focusing.
Focusing Distance Range (mm) Magnification (×)
Close distance Long distance Close distance Long distance
EF12 II 1700 7529 0.22 0.04
EF25 II 1480 3727 0.28 0.09
Focusing Distance Range (mm) Magnification (×)
Close distance Long distance Close distance Long distance
EF12 II 2375 13353 0.21 0.03
EF25 II 2113 6494 0.26 0.07
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