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Aperture size has an effect on depth of field (the degree to which points that are out of focus are blurred). I think in practical cameras, aperture size isn't
by codeflo 5y ago
Aperture size has an effect on depth of field (the degree to which points that are out of focus are blurred). I think in practical cameras, aperture size isn't constant as you vary camera size, so that makes the scale relevant. But I'm not 100% sure how photography terminology like "stops" maps to the underlying geometry, so take this with a grain of salt.
- thequux 5y agoThe "f/" in aperture settings literally stands for "focal length divided by ...". e.g, an f/2 aperture on a 50mm lens has a diameter of 25mm. One aperture stop corresponds to a scaling factor of sqrt(2), because the area of the aperture scales with the square of the diameter, and halving the area results in half the light (and 1/1.414... of the aperture diameter)
- roelschroeven 5y agoMore specifically the f/ number relates to the size of the entrance pupil (the optical image of the physical aperture stop, as seen through the front of the lens) rather than the size of the physical aperture. Depending on the construction of the lens and where in the lens the aperture is located, the two can differ quite a lot.