I've had a long and happy acquaintance with
Steiner porro prism binoculars. Steiner porros are almost a binocular breed unto themselves - very distinctive in appearance and always solid optically. Although individual eyepiece focus
binoculars are not the preferred choice for an all around birding binocular, a
Steiner Autofocus (Steiner's lingo for individual eyepiece focus) makes a great mid to long range birding binocular. I knew a fellow birder who would stubbornly stick with his Steiner 7x50 Military Marine, even for close in work. Wasn't pretty watching him scramble to focus both eyepieces before a bird moved, again, but no way would he part with that Steiner binocular. That Steiner porro prism bino was like his right arm. Who could argue with him? He was an excellent birder. Me, I'll stick with center focus for close in work, but I can also say that a high end 7x50, like the
Steiner 7x50 Nighthunter, will knock your socks off, optically.