Explanation: AE-L is the abbreviation for „auto exposure lock“, AF-L for „auto focus lock“. This button can „freeze“ the exposure and / or focus at the moment you push it and as long as you hold the button pressed. An indicator „AE-L“ will be displayed in the viewfinder as long as the exposure metering is locked, for the autofocus lock there is no display to confirm it.
What exactly this button does is defined in the custom setting menu f5 AE-L/AF-L button. If you have not changed it it will lock both exposure metering and autofocus.
Tips: The auto exposure lock is simple and effective if you have a subject with high contrasts and want to get the exposure right for a certain area.
To achieve this
- Point the viewfinder to a place that has similar brightness as the main subject that you want to get correctly exposed
- then push the AE-L/AF-L button and hold it until you have recomposed the image in the viewfinder and pressed the shutter release button.
But careful: Because in the default settings the AE-L/AF-L button will also lock the focus you need to either focus correctly beforehand or change the custom setting menu f5 Assign AE-L/AF-L button to lock exposure only.