Canon EF-S 17-55 f/2.8 IS USM EF-S17-55mm F2.8 IS USM Instruction Manual - Page 9

6 Filters (Sold Separately) You can attach filters to the filter mounting thread on the front of the lens. ¡Only one filter may be attached. ¡If you need a polarizing filter, use the Canon Circular Polarizing Filter (77mm). ¡To adjust the polarizing filter, first remove the lens hood. 7 Extension Tubes (Sold Separately) You can attach Extension Tube EF12 II for magnified shots. The shooting distance and magnification are shown below. Camera-to-Subject Distance (mm) Magnification Near Far Near Far 17mm EF12 II 55mm 205 Incompatible 334 0.45× 0.23× Although Extension Tube EF25 II can be attached, it is not recommended because the lens-to-subject distance will be very short. Manual focusing is recommended for accurate focusing. ENG-8