Canon EOS 50 E - Page 52

Part 2: Technical Information
4) AF-llluminator
The camera body has a built-in AF-Illuminator which links to all three focusing points.
(The AF-Illuminator can be disabled with Custom Function No. 7.) It throws a horizon-
tal-line pattern, which is effective for the vertical BASIS sensors.)
Figure 2-7 shows the AF-Illuminator's optical system. Unlike the EOS 10S and EOS
5/A2E which used a patterned LED for multiple focusing points, the EOS 50 / ELAN II
has an AF - Illuminator divider panel coupled with an external panel. The Illuminator
divider panel is in front of the light pattern which is geared to illuminate only the center
focusing point area. The same system is used by the EOS Elan and EOS 1 000N /Rebel
II. The AF-Illuminator covers the area of a 28mm lens.
When an external flash unit is used and it has an AF-Illuminator, the higher perfor-
mance AF- Illuminator is used as follows:
• With the 540EZ (multiple-point AF-Illuminator provided): The 540EZ's AF-
Illuminator is emitted automatically and the camera's AF-Illuminator is never
used.
• With other EZ-series Speedlites and the 160E: The camera's AF-Illuminator is
used. The Speedlite's AF-Illuminator is emitted automatically only when the cen-
ter focusing point has been selected with the Command Dial.
AF-llluminator
divider panel
AF-llluminator pattern mask
Projection lens
Fig. 2-7 AF Illustrator optical system (top view)
2-8