Lately I realized that a lot of my pictures have the horizon in the middle. Not because it is a creative choice, but because a) I cannot visualize a crop in the viewfinder when composing and b) I like my verticals straight, even in nature shots. I also remember that in my film days I used my shift lenses all the time once I got them, after agonizing for a long time if they would be worthwhile the rather large expense. Hence the idea to get a shift lens again, this time for the A7 instead of the Nikon F3. For me there's simply no substitute for shifting the viewfinder image until a pleasing composition appears right there and then. The image quality must be excellent, I intend to print big, think 50x75cm. So what are the options for a shift lens on the A7? Easy, it seems: just buy a legacy shift lens, there are enough options. However, I'm afraid that the image quality won't be sufficient for the high-resolution A7 sensor. Years ago I did a test with the PC Nikkor 28mm 1:4 on the D200 (10 MP) and it had too many deficiencies to be useable: objectionable distortion, strong CA, color became cooler in the extreme areas, sharpness wasn't great. There are some premium MF lenses, notably the Schneider PC-Angulon 28mm 1:2.8 and the Zeiss Distagon PC 35mm 1:2.8. I have no experience with them, but maybe someone else has? Some people think highly of the Olympus OM 24mm shift lens, but others disagree (according to Fred Miranda posts). Given that I prefer something like 40-45mm as a focal length and I want very high quality, the current Canon 45/2.8 TS-E or Nikon 45/2.8 PC-E come to mind. The Nikon won't do because its aperture is electronically controlled and there is no adapter to convey the signals from the A7 to it. That leaves the Canon 45/2.8 TS-E as the only option, using a Metabones EF-NEX Smart Adapter III. Big question of course: what will be the image quality? Will it be sharp even when shifted? What about distortion? Correction of distortion for shifted images would be difficult at least, if not nearly impossible, and I don't think it's possible to make a profile for that. I realize that using an APS-C camera like my NEX-6 would offer a multitude of options when using an adapter with shift capability. However, I want to use full-frame. And even if I wanted to go back to APS-C I expect subpar performance from legacy lenses around 28mm when shifted towards the edge of their image. I'd like to know what others think of this. Is the Canon 45/2.8 TS-E a viable option? Are there other high-quality shift lens options I'm overlooking? Thanks.