Like all other types of batteries, Li-ion batteries will wear down over time, holding less and less charge. Apple says its laptop batteries will reach 80% of their original capacity after âup toâ 1000 full discharge cycles. Other manufacturers commonly rate their batteries 300 to 500 cycles.
A digital single-lens reflex camera (also called a digital SLR or DSLR) is a digital camera that combines the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor, as opposed to photographic film.
DSLR cameras use what is called phase detection to focus on a subject, while mirrorless cameras use contrast detection. Phase detection takes advantage of the mirror in a DSLR camera to divide the incoming light into pairs of images, compares them, and then quickly focuses the lens on the subject.