Canon EF24 User Manual download pdf (Page 9)

ENG-8

6. Infinity Distance 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 L mark is

aligned with the distance indicator on the

distance scale.

For accurate manual focusing on subjects at

infinity distance, look through the viewfinder while

rotating the focusing ring.

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.

7. Infrared Index

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 also when you take the picture.

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Canon EF24 User Manual Page 9