![]() ![]() The difference in f-number doesn't just affect light gathering properties. ![]() This can have a significant effect on low-light performance, with f/2.0-lensed smartphones typically producing stronger results than their f/2.4 counterparts. f/2.4 is a half stop less than f/2.0, therefore an f/2.0 lens transmits 50% more light to the sensor. Smartphone cameras typically use apertures ranging from f/2.0 to f/2.4, which are both wide in the overall camera ecosystem, but there are big differences between the two. The 20.7-megapixel, 1/2.3" Sony Exmor RS sensor in the Sony Xperia Z2, paired with an f/2.0 lens. ![]() Instead, due to the circular nature of an aperture, double the f-number is a two stop difference, providing one quarter the light gathering area. Differences in f-number aren't immediately obvious though, as double the f-number doesn't equate to half the light gathering area (one stop less). The lower the f-number, the wider the aperture and thus more light is able to pass through. An f-number of 2, expressed typically as f/2, means the focal length is twice the size of the aperture f/4 would be a focal length 4 times the aperture, and so forth. The f-number is a ratio between the focal length and size of the hole, and tells you how much light can pass through to the sensor. Aperture, Image Stabilisation, Focus, ISO, Shutter Aperture and F-NumberĪ much more important value is the size of the camera's aperture, commonly listed as an f-number. ![]()
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