Since it was announced just over a month ago, I have been anxiously anticipating the arrival of a Sony a7 Mark III camera. It is a mirrorless design, unlike the Canon DSLR (digital single lens reflex) system that I have used for the past twenty years.  Mirrorless cameras offer a fundamentally superior architecture but until recently have not been able to match the viewfinder experience of an SLR.  Sony’s last two models have rectified that and gone much further.  Canon and Nikon have been relegating their mirrorless offerings to the low end of the market and Sony has now created a superior camera that strikes at the heart of their professional market.  I found it compelling enough to switch systems wholesale and can’t wait to start shooting with it.