Using the Autofocus modes on your Canon DSLR

Canon DSLRs have sophisticated autofocusing systems that can get subjects sharp faster than the blink of an eye. Here’s how to get the best from them

- Angela Nicholson

Canon’s first 35mm SLR with auto focusing, the T80, was introduced back in 1985. At that time there was some scepticism about auto focusing, with many photographers questioning the need for it and doubting its accuracy. Leap forward over 30 years to the modern day and there are many photographers who have never used a manual focus camera, and even more who would question not using auto focusing. In fact, these days we almost take auto focusing for granted, but it’s worth spending some time understanding the options that are available in order to get the best from it.

One-shot AF

Of the three AF modes offered on Canon DSLRs, One-shot AF mode is the most commonly used and many people regard it as the ‘standard’ auto focus option. When this mode is selected, the camera focuses the lens when the shutter release is pressed halfway down. Once focus is achieved, if the button is kept held down the lens will not adjust the focus even if the subject or the camera moves. If you want to refocus the lens you have to lift your finger from the shutter release and half-press again.