Canon EF 17-40mm f4L USM - Manual (Page 9)

ENG-8
There is a gelatin filter holder at the rear of the
lens. Cut the gelatin filter to fit within the white
frames. Then insert the gelatin filter into the filter
holder.
8. Filter Holder
• Only one filter can be used.
• When you use a gelatin filter, ghosting may
appear in the image.
You can attach Extension Tube EF12 II or EF25
II for magnified shots. The shooting distance and
magnification are shown below.
9. Extension Tubes
(Sold separately)
Camera-to-Subject
Magnification
Distance (mm)
Near Far Near Far
EF12 II
17mm 155 159 0.83
Ч
0.70
Ч
40mm 206 271 0.59
Ч
0.32
Ч
EF25 II
17mm Incompatible
40mm 196 218 1.02
Ч
0.70
Ч
Manual focusing is recommended for accurate
focusing.
COP
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