Canon TS-E 17mm f/4L TS-E17mm F4L Instruction Manual - Page 19

11. Filters (Sold Separately) (TS-E24mm f/3.5L II) You can attach filters to the filter mounting thread on the front of the lens. ● Only one filter may be attached. ● Use a polarizing Canon filter (82mm). A filter cannot be used with TS-E17mm f/4L. 12. Infinity Compensation Mark (TS-E24mm f/3.5L II) Infinity compensation mark 1.5 2 3 5 ft 0.5 0.7 1 3 m 22 11 4 4 11 22 Distance index To compensate for shifting of the infinity focus point that results from changes in temperature. The infinity position at normal temperature is the point at which the vertical line of the L mark is aligned with the distance indicator on the distance scale. For accurate focusing of subjects at infinity, look through the viewfinder's magnified image* or the LCD screen's magnified image* while rotating the focusing ring. * For cameras with Live View shooting capability. ENG-18