I posted this over on LFF but have kind of been running around chasing my proverbial tail with it. Basically I need lenses that will cover 16x20 ULF format at infinity, preferably with some degree of movements. What I have gleaned so far that other than rare and super pricey Schnieder XXL lenses like the 550, it is either going to have to be a Nikkor 450mm F9 M or something longer than a 30" Artar or 760 Apo Nikkor. I'm not willing to go to a smaller format as it does not work for the markets I have in mind, so 16x20 it is. So rather than what you have heard, what are shooters of 16x20 actually using for landscapes at infinity? I want it sharp in the corners, I don't want these prints looking like they were made in 1870, that is not my style, I need sharp.