Practically all cameras have automatic focusing systems where they can check the focus at different points around the frame and then adjust the lens’s focus so that that point in the scene is precisely in focus. You can let the camera choose the autofocus (AF) point automatically or select it yourself (manual AF point selection). […]
Almost all modern cameras have an autofocus system, where the camera automatically focuses the lens on a subject in the picture. They do this with multiple focus points arranged around the frame. You can choose the focus point you want the camera to use, or you can let the camera choose the focus point automatically – it will usually choose the subject nearest the camera. Here are some more articles about autofocus, the different technologies used and how to get the best results.
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.
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 […]
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 […]
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 […]