This is the adjustable hole in the lens diaphragm that controls how much light passes through the lens and is used to adjust the exposure. Aperture setting values are the same across all cameras and lenses, and here’s a part of the series: f/2.8, f/4, f/5.6, f/8, f/11 – though the theoretical aperture range is much wider than any single lens can manage. The maximum aperture – how wide the lens opening can go – is a big selling point because wider apertures let more light through. The lens aperture also has an effect of depth of field, or the near-to-far sharpness in the picture, and the number of aperture blades is a selling point because it affects the way the lens’s ‘bokeh’.
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