Infinity Compensation Mark; Infrared Index - Canon EF 70-200mm f/2.8L IS USM Instruction

8. Infinity Compensation Mark

To compensate for shifting of the infinity focus
point that results from changes in temperature,
you can rotate the distance scale slightly past
the normal infinity focus mark.
• The infinity position at normal temperature is the point
at which the vertical line of the
with the distance indicator.
• For accurate manual focusing on subjects at infinity
distance, look through the viewfinder to confirm
focusing while rotating the focusing ring.
ENG-10
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.
• The compensation amount differs depending on the
mark is aligned

9. Infrared Index

focal length. Use the indicated focal length as a
guide when setting the compensation amount.
Some EOS cameras cannot use infrared film. See
the instructions for your EOS camera.
• The infrared index position is based on a
wavelength of 800 nm.
• Be sure to observe the manufacturer's
instructions when using infrared film.
• Use a red filter when you take the picture.