Infinity Compensation Mark; Infrared Index - Canon EF 24-70mm f/4L IS USM Instructions Manual

8. Infinity Compensation
Mark
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.
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.

Infinity compensation mark

Distance index

9. Infrared 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.
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.
● ●
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