Canon EOS RP, Instruction Manual

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Selecting the AF Method
Shooting Conditions that Make Focusing Difficult
z
Subject with low-contrast such as the blue sky, solid-color flat surfaces or
when highlight or shadow details are clipped.
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Subjects in low light.
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Stripes and other patterns where there is contrast only in the horizontal
direction.
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Subjects with repetitive patterns (Example: Skyscraper windows,
computer keyboards, etc.).
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Fine lines and subject outlines.
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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.
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The image flickers under fluorescent or LED lighting.
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Extremely small subjects.
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Subjects at the edge of the screen.
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Strongly backlit or reflective subjects (Example: Car with a highly
reflective body, etc.).
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Near and distant subjects covered by an AF point (Example: Animal in a
cage, etc.).
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Subjects that keep moving within the AF point and will not stay still due to
camera shake or subject blur.
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Performing AF when the subject is very far out of focus.
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Soft focus effect is applied with a soft focus lens.
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A special effect filter is used.
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Noise (dots of light, banding, etc.) appears on the screen during AF.
AF Range
The available autofocus range varies depending on the lens and aspect
ratio used and whether you are recording 4K movies or using features such
as Movie cropping or Movie digital IS.