Excerpt: Absolutely worst macro lens I ever had. I'm so disappointed, wasted 3 days of work and over 3000 images!. It does not shot what you select in focus, it pics randomly one very small part of the image as focus and puts everything else in blur as dept of field.
Summary: Bought this to pair with my Sony a6000 and it works well! I've been taking pictures of plants and insects and you've got to get realllllly close, but the detail is fantastic. The only drawback:The aluminum casing scratches VERY easily.
Summary: Simply superb resolution. If you don't believe me, look at the MTF tables. Unbeatable clarity, contrast and resolution at f8. I know you might need to be a bit closer than with a 50m, but not that much. 1:1 and done... GREAT.