Canon EOS 70 Instruction Manual page 142

Using AF to Focus
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Shooting conditions which can make focusing difficult:
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Low-contrast subjects such as the blue sky and solid-color, flat
surfaces.
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Subjects in low light.
~ Stripes and other patterns where there is contrast only in the
horizontal direction.
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Under a light source whose brightness, color, or pattern keeps
changing.
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Night scenes or points of light.
• Under fluorescent lighting or when the image flickers .
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Extremely small subjects.
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Subjects at the edge of the picture.
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Subjects strongly reflecting light.
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The AF point covers both a near and faraway subject (such as an
animal in a cage).
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Subjects which keep moving within the AF point and cannot keep
still due to camera shake or subject blur.
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A subject approaching or moving away from the camera .
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Autofocusing while the subject is way out of focus.
~ Soft focus effect is applied with a soft focus lens.
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A special effects filter is used.
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