Anyone with experience with this lens? I searched the forum and google and couldn't find much other than it is essentially a Rodenstock grandagon N. Currently i am using a older Schneider 90mm f8 MC that i found for a $100 in like new condition. I want the 75mm f4.5 in hopes that it will be a little brighter for focusing. It will be mounted on a Toy-Field 45 AII The big question is if you have used one how is it to focus and contrast? And I'm going to assume unless its a bad copy that it is going to be tack sharp like all other LF lenses lol.