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.
So the DSLR class still camera used for video lets in much more light. That's the primary advantage, but there are others. Another is depth of field. The depth of field of a lens is only based on the aperture and focal length.. but as you go to a larger sensor, you need a longer lens to get a normal field of view.