Quote Originally Posted by rich815 View Post
I doubt anyone can. And frankly I've found zone focusing for anything 28mm or wider works 98% of the time for me, but I rarely shoot my ultra wide lenses at wide open apertures or with main subject very close up...
I used my Noctilux all the time with a 0.58 finder. It improved my shooting tremendously. The focusing wasn't a problem. If the camera and lens are well calibrated everything snaps in place. The whole point of different magnifications is about the composition, not about accurate focusing.