Canon AT 1 User Manual

Page 104

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instance normally, when the focus is adjusted

at 5m on the distance scale, you turn the
focusing ring slightly so that the 5 on the

distance scale matches the red dot infrared

index mark.

When photographing with infrared black

and white film, visible light rays must be kept

out by means of a deep red filter ( R 1 ) over

the lens. The position of the infrared index
mark is fixed for infrared film most sensitive
to the 800m/.( wavelength and use of a red

filter. For example, the Kodak Film IR 135
and the Wratten Filter 87.

When performing infrared color photo

graphy, follow the directions of the specific

instructions of the film manufacturer.