Canon AF 35 ML - Manual (Page 31)

Subjects which Require Special Attention in Focusing
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The following subjects are difficult for the
autofocusing system to focus exactly:
1 Subjects without vertical lines (window
blinds, a series of waves in the ocean).
2 Subjects with little or no contrast (light-
colored or white objects).
3 Subjects with an object in front of them
(zoo animals in a cage).
4 Subjects with strong reflections or brightly
backlit subjects.
5 Subjects composed of very small, uniform
parts (a patch of grass or a bed of very small
flowers).
6 Subjects in low-light situations (usually
noted by the camera-shake warning signal).
The method below is usually effective for
focusing the above subjects:
Compose the picture so that the autofocus
frame covers a substitute subject, which is
approximately the same distance as your
main subject. Then press the shutter button
halfway, making sure one of the zone-focus
symbols lights up in the viewfinder.
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