Canon EF300mm f/2.8L IS II USM Instructions Manual page 21

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
Focusing Distance Range (mm)
Close distance Long distance Close distance Long distance
EF12 II 1700
EF25 II 1480
EF400mm f/2.8L IS II USM
Focusing Distance Range (mm)
Close distance Long distance Close distance Long distance
EF12 II 2375 13353
EF25 II 2113
MF mode is recommended for accurate focusing.
Magnification (×)
7529 0.22
3727 0.28
Magnification (×)
0.21
6494 0.26
0.04
0.09
0.03
0.07
ENG-20