![]() However, there are many situations where the default behavior isn’t desirable. In many, if not most, situations, having the AF start when the shutter release is being pressed is actually useful if not desired behavior. Naturally, the next question might be why wouldn’t someone want the AF system to trigger when the shutter release is half pressed? Instead the camera just makes a meter reading and is ready to trip the shutter. When the camera is configured for rear button focusing, step 1 and 3 are skipped when the shutter release is half pressed. In one shot mode, when the AF system has locked on target, lock the metering value.In their default configuration, Canon cameras will do a number of things when the shutter release is either half pressed. Rear button, also called two button, focusing is way of configuring your camera that decouples the activation of the autofocus system from the shutter release. This technique goes by a number of names, but frequently it’s called rear button focusing or two button focusing. However, many serious and professional photographers describe and advocate using a technique that decouples the AF from the shutter release and puts it on its own button. For many users, this is an entirely effective way to work the camera. The default configuration for all auto focus SLRs is to enable both the exposure meter and the autofocus system when the shutter release is half pressed. What is Rear Button/Two Button focusing?. ![]()
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December 2022
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