Comparing digital single-lens reflex (DSLR) and mirrorless cameras. Which one is right for you?
Summary
In DSLRs, a system of mirrors, or a glass prism, in the center of the body sends light from the lens into the viewfinder by reflecting it as the name indicates. The concept of autofocus is similar in the two systems, but there is an important difference: a DSLR is otherwise blind while focusing because it only projects the picture of the scene to us – the photographer, while a mirrorless camera is constantly processing the full-frame image even when we aren’t shooting and can analyze what it finds useful. This mode makes them somewhat makeshift “mirrorless cameras.” The optical viewfinder, our window to reality, will always react a bit faster than the digital one, even if the difference isn’t very big. A through-the-lens optical viewfinder doesn’t use as much power and DSLRs have a battery life that is several times longer than that of their mirrorless counterparts. An example is Olympus, whose camera allows images to be stored to a temporary memory while looking through the viewfinder and saves them after you press the shutter button.