More... Whole picture. Bottom left at 100% Bottom right at 100% And my conclusion is... It's not up to modern standards and I'm sure that there are better old lenses but all in all it's better than I thought it would be for a cheap old wide lens I mostly shot wide open, f5.6 and f8 and usually picked something as my point of focus rather than setting up and going for front to back and side to side hyperfocal type shots. Wide open and / or focused close things can get a bit funky but by f8 if you want the best results this lens can give it's getting there and possibly as good as it's going to get at f11. I wouldn't say it's terrible though, with the caveat that at its widest aperture or two and when going for shallow DoF it's not up to modern standards or those of upmarket legacy lenses. It's certainly sharp enough in the central area and if you stop down to f8-11 and go for it decent enough performance throughout the frame is possible. IMO PS. I think that some of the shortcomings are going to be hidden when looking at whole pictures, even at 100% I don't think this is too bad.