Although the branch with it's berries is quite sharp and, for me, quite pleasing to look at the problem with the f3.5 lenses is obvious to see. I thought I has enough background separation here to render is smooth. Well I didn't although it was quite aways away. I'm certain an f2.8 or f2.5 lens would have rendered this much better than the f3.5 lens. But those lenses are a bit larger and heavier than these little f3.5 lenses. For some people the above image would not make the grade and a faster lens would have to come into play. For me however, it's good enough. Notice I'm getting better at this manual focus stuff.