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RF 85mm f /1.2 L USM; RF 85mm f /1.2 L USM DS — Same as the above, except includes "defocus smoothing" technology intended to improve bokeh. According to Canon, the effect is similar to that of an apodization filter, but achieved through special lens coatings instead of a filter. [14] RF 24–240mm f /4–6.3 IS USM; RF 15–35mm f /2.8 L IS USM
Front and rear views of a Canon EF50mm f/1.4 USM. The EF 50mm lenses are a group of normal prime lenses made by Canon that share the same focal length.These lenses are based on the classic double-Gauss lens, [1] with the f/1.8 being a standard six-element double-Gauss with an air gap and powers between element 2 and 3 [1] and its faster cousins adding additional elements. [2]
f / 3.5–5.6 IS 2009 No No No Yes IS STM 2012 No No Yes Yes IS USM 2016 No Yes No Yes 18–200mm: 28.8–320 mm f / 3.5–5.6 IS 2008 No No No Yes 55–250mm: 88–400 mm f / 4–5.6 IS 2007 No No No Yes IS II 2011 No No No Yes IS STM 2013 No No Yes Yes 24mm: 38.4 mm f / 2.8 STM 2014 No No Yes No 35mm: 56 mm f / 2.8 IS STM 2017 Yes No Yes Yes ...
Prime L lenses have a much larger maximum aperture, such as Canon's current 50mm and 85mm L lenses with maximum apertures of f / 1.2. All current L-series lenses have ultrasonic autofocus motors (USM) with an exception of RF 10–20mm f/4 L IS STM lens, and extra communication pins, except for the specialist tilt-shift lenses which do not ...
With a 2× extender a 400mm f/4 lens would have an equivalent focal length of 800mm and a maximum aperture of f/8, in which case autofocus would only be available with professional bodies. With the same converter a 400mm f/5.6 lens would have a maximum aperture of f/11 and autofocus would be disabled.
The normal "full-stop" f-number scale for modern lenses is as follows: 1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32, but many lenses also allow setting it to half-stop or third-stop increments. A "slow" lens (one that is not capable of passing a lot of light through) might have a maximum aperture from 5.6 to 11, while a "fast" lens (one that can ...
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