Understanding the differences between the two types of cameras is important when choosing either a Difference Between Mirrorless and DSLR Camera. DSLRs AKA rock-solid cameras are distinguished with their optical viewfinders, of longer battery life, and since it has been there longer in the market, it definitely has a huge stock of lenses at disposal. On the downside, they're bulkier and slower to focus, particularly with video. Mirrorless cameras are said to be less bulky and weightier and use an electronic viewfinder to preview exposure on the fly. These cameras make the most out of video and fast autofocusing levels, with mirrorless cameras having limited battery lives. Your specific needs will dictate what suits you best.