Canon EF 16-35mm f/4L IS USM EF16-35mm f/4L IS USM Instructions - Page 8

4. Infinity Compensation Mark Infinity compensation mark 5. Infrared Index 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 distance scale L mark is aligned with the distance index. The infrared index corrects the focus setting when using monochrome infrared film. Focus on the subject manually, then adjust the distance setting by moving the focusing ring to the corresponding infrared index mark. Some EOS cameras cannot use infrared film. See the instructions for your EOS camera. For accurate manual focusing of subjects at infinity, look through the viewfinder or look at the magnified image* on the LCD screen while rotating the focusing ring. * For cameras with Live View shooting capability. ●● The infrared index position is based on a wavelength of 800 nm. ●● The compensation amount differs depending on the focal length. Use the indicated focal length as a guide when setting the compensation amount. ●● Be sure to observe the manufacturer's instructions when using infrared film. ●● Use a red filter when you take the picture. ENG-7