This is the physical size of a camera sensor, which is independent of the number of megapixels it has. Bigger sensors capture more light and produce sharper, clearer images with less noise. In fact sensor size is the single most important factor these days in a camera’s picture quality – megapixels are mostly secondary.
Sony’s umbrella term for its camera autofocus technologies. It’s saying that it doesn’t just identify and track objects in three-dimensional space but over the fourth dimension (time) too. Other makers have similar systems but use their own names for this technology. Related photo-factoids
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. Related photo-factoids
There are two things to know about autofocus. The autofocus mode is WHEN the camera focuses, e.g. single AF mode to focus just once when you half-press the shutter button or continuous AF mode to focus continuously. AF points are WHAT the camera focuses on, which can be a focus point in the scene that […]