The largest trend in photography over the last five years or so, not counting smartphones, has been the emergence and maturity of mirrorless camera systems. These operate in a very different manner from traditional SLRs, and as such market leaders with decades embedded in the latter — namely Canon and Nikon — have resisted making the shift. That changes for Nikon today with its announcement of the Z6 and Z7, which show the company is making the change wholeheartedly....