This stands for AE (auto-exposure) and AF (autofocus) lock. Often it’s useful to fix the exposure settings and focus point ahead of taking a picture and on most cameras you can do this by half-pressing the shutter button, holding it in position, then reframing the picture. By default, the AE-L/AF-L button does the same, locking […]
An area on the screen where the camera can check for sharp focus. Typically, the more focus points the better because this gives you more choice about where to focus and usually indicates a faster and more sophisticated focus system.
In dim lighting the camera’s autofocus system may struggle to lock on to your subject, but on some cameras a lamp on the front of the camera will light up in low light and shines a bright, tightly focused beam of light at your subject to help the autofocus system lock on. Not all cameras […]
Digital cameras use an array of AF points (focus points) to cover different areas of the frame, but they don’t necessarily cover all of it. The AF coverage is the percentage of the frame width and height that contains focus points. Wider coverage is a selling point.
Most cameras use the main sensor for focusing, but digital SLRs have a different system. They use a separate phase detection autofocus sensor which must be precisely aligned with the main sensor for the focus to be accurate. Sometimes this and different lens designs can lead to small misalignments and slight focus errors, so more […]