One is none, two is one...............I carry two !

Nikon 800 is always at the ready & Bushnell 1200 in my pack for longer shots.

First thing I do once I arrive at a area when I am going to sit for a while - range stand out objects in that area so I can judge distance if an opportunity presents it's self quickly.

If I need to break-out my Bushnell I figure I have the time and I know that the distance requires a much more precise shot !