I am wondering what people look for in a focusing loupe, what features help their picture taking or just make their lives easier. How much magnification seems optimal, is the ability to focus the loupe important, does the loupe need something to protect the ground glass, what or which have greater eye relief (eyeglass wearer). I'm just curious to hear about most anything that users find to be important in their louping experience, and what brands/types they find most satisfying.