Infrared Index - Canon EF 70-200mm Instructions Manual

5. Infinity Compensation Mark
Distance scale
To compensate for shifting of the infinity focus
point that results from changes in temperature,
there is a margin at the infinity (∞) position.
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

6. Infrared Index

Distance scale
The infrared index corrects the focus setting when
using monochrome infrared film. Focus on the subject
manually, then adjust the distance scale indicated by
the distance index by moving the focusing ring to the
corresponding infrared index mark before shooting.
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 (large at the wide end, small
at the telephoto end). Use the 100 or 70 (mm)
infrared index position as a guide when setting
the compensation amount manually.
Be sure to observe the manufacturer's
● ●
instructions when using infrared film.
Use a red filter when you take the picture.
● ●
Infrared Index
ENG-9