Trying to get into photography. How and why does aperture affect focus?
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As the aperture is set to a smaller diameter (higher F stop) rays of light from out-of-focus details in the image are channeled into smaller points on the sensor, which affects the apparent sharpness of these details. As the aperture diameter decreases, depth of field increases both in front of and behind the plane of focus.
With the aperture wide open (lower F stop), the only details that will be in sharp focus are those at the specific distance the lens is focused on. Everything closer to the camera and further away from the plane of focus becomes progressively softer the more distant they are from the point of focus.
There’s a lot of physics and math involved, but that’s the gist of it.
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