Canon EF 8-15 mm f/ 4 L USM Fisheye Lens Instruction Manual (en)

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You can attach filters to the filter mounting thread
on the front of the lens.
9. Filters 
(Sold Separately)
• Filters and the macro flash cannot be used on
this lens at the same time.
• If you need a polarizing filter, use the Canon
Circular Polarizing Filter (58mm).
• To adjust the polarizing filter, first remove the
lens hood.
You can attach Extension Tube EF12 II or EF25
II for magnified shots. The shooting distance and
magnification are shown below.
10. Extension Tubes 
(Sold Separately)
Camera-to-Subject 
Magnification
Distance (mm)
Near
Far
Near
Far
EF12 II
314
1002
1.19
×
0.12
×
EF25 II
319
606
1.39
×
0.26
×
Manual focusing is recommended for accurate
focusing.