I recently adapted a couple of old 50mm Minolta MD mount fast prime lenses to my canon T3i with the help of a fotasy brand CNC machined adapter with a couple of glass elements in it to make up for the flange distance and aps-c sensor size, the results were truly quite amazing. This lens is manual focus only, and quite a narrow field of view, so getting the shot you want can sometimes be a bit of a challenge, but when you do get a shot, the bokeh is very soft and pleasing, and the depth of field is incredibly shallow.
As you can see, the results speak for themselves. The details are relatively sharp, but the bokeh is very soft due to this lens very shallow DOF
Not bad for 12$ 🙂