Canon EF 24-105mm f/4L IS II USM User Manual download pdf (Page 10)

ENG-9

Distance index

Innity compensation

mark

To compensate for shifting of the innity focus

point that results from changes in temperature,

there is a margin at the innity (∞) position.

The innity 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 innity,

look through the viewnder or look at the magnied

image* on the LCD screen while rotating the

focusing ring.

* For cameras with Live View shooting capability.

Infrared Index

The infrared index corrects the focus setting when

using monochrome infrared lm. 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 lm. 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 50 or 24 (mm)

infrared index position as a guide when setting

the compensation amount manually.

 Be sure to observe the manufacturer’s

instructions when using infrared lm.

 Use a red lter when you take the picture.

Innity Compensation Mark

6. Infrared Index

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Canon EF 24-105mm f/4L IS II USM User Manual Page 10