The Shutter-priority AE mode was first introduced by Canon via its manual focus Canon AE-1 35mm SLR camera back in 1976 at a time when all the other 35mm SLR cameras had featured Aperture-priority as the only AE mode option to the old-time favourite of Metered Manual mode preferred by most professionals who still do not trust the built-in metering systems of their cameras in those days. With the exceptions of the manual-focus Canon AV-1, T50 and T60 35mm SLR cameras as well as the T80 and EOS 850 AF models, all the other Canon 35mm SLR cameras introduced after the AE-1 has the Shutter-priority AE mode as one of the various AE modes offered. Getting good exposures is a matter of balancing shutter speed against aperture value. Changing one affects the other. If the shutter speed becomes faster, then for the same amount of light to reach the film, the aperture has to be opened wider. EOS users can choose Shutter-priority AE mode when the main concern is with capturing moving subjects. Obviously, you need a fast shutter speed to prevent blurring to camera shake (when using long lenses) or when you wanted to freeze the subject in its track rather than capturing the motion. Shutter-priority AE is the best choice for shooting sports; because things happen fast and not all types of sports can be shot with slow shutter speeds like for example, athletic events like long jump and high jump, 100, 200 and 400 metres races, tennis, baseball, rugby, swimming and basketball. Occasionally, you do see examples of a 100 or 200 metres races being shot using slower shutter speeds but the majority of sports photographers prefers to have the eventual winner recorded on film without any motions or blur caused by slow shutter speeds. Sporting events where slow shutter speeds can be used are Formula One and Grand Prix motorcycle racing, marathons, water-skiing, powerboat racing and cycling to enable the effects of 'panning" so as to create a feeling of speed or motion. << Back to Main . 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8 . 9 . 10 . 11 . 12 .