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Focus is the mechanism of converging light from a point light source onto an imaging plane by a lens.

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How does aperture affect focus area? [duplicate]

How does the aperture affect the focus area? Here are some examples: With an 35mm(50mm)/f1.8 prime lens What f-value will bring a group of people standing in five rows into focus? … What f-value will bring the entire face and body into focus, when shooting close-ups or portraits? How do you focus on two peoples standing far from each other? …
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