Canon EF 300mm f/4L IS USM Instruction page 12

10. Extension Tubes
You can attach Extension Tube EF12 II or EF25
II for magnified shots. The shooting distance and
magnification are shown below.
Camera-to-Subject
Distance (mm)
Near
EF12 II 1338
EF25 II 1216
Manual focusing is recommended for accurate
focusing.
(Sold separately)
Magnification
Far Near Far
7795 0.30× 0.04×
3946 0.37× 0.09×
11. Close-up Lenses
Attaching a 500D (77mm) Close-up Lens
enables close-up photography.
Magnification will be 0.82× – 0.59×.
• Close-up Lens 250D cannot be attached
because there is no size that fits the lens.
• Manual focusing is recommended for accurate
focusing.
(Sold separately)
ENG-11