How autofocus systems work
How to set up autofocus on your DSLR
AF is a key camera functions, most models offer a simple way of changing modes. Here we show how to set it on five popular DSLRs from the leading brands. If you own a different model you’ll find it follows a similar set-up
CANON EOS 5500
AF MODE: Press the AF button on the four-way control. Choose One Shot, Al Focus or Al Servo mode.
AF POINTS: Press the AF point selection button on the top right of the camera’s rear. Use tie input dial by the shutter release to choose automatic or manual point selection. If manual, use the four-way control to choose the AF point.
AF MODE: Press the info (i) button and scroll to Focus mode. Press ОИ and use the four-way control to select AF-A, AF-S, AF-C or manual focus. Press OK to confirm.
AF POINTS: Press the info button and scroll down to the AF-area mode option. Choose between Single-point AF or Auto-Area AF. With single-point AF, use the four-way control to choose an AF point.
AF MODE: Press OK and scroll to the AF mode option. Press OK again and choose between
S-AF (single-shot AF), C-AF (continuous AF) and MF (manual focus).
AF POINTS: Press OK and scroll to the AF Area option. You can then use the command dial to select all the AF points or select an individual point
AF MODE: Press the MENU button and use the four way control to select AF Mode. AF.S is the single-shot AF mode, while AF.C is continuous AF mode.
AF POINTS: Press the MENU button and use the four-way control to go down to Select AF point. Choose from Auto, multi-point or spot AF (the camera uses the central AF point only.
SONY ALPHA 580
AF MODE: Press Fn and choose the Autofocus mode option using the four way control. Choose between AF-S AF-A or AF-C mode.
AF POINTS: Press the Fn button and choose the AF area option using the four-way control. Choose between Wide (all points), Spot (centre point) and Local (manual selection of any of the AF points)