500

I think you should have used f 11 instead of f4. The out of focus benches bother me.

I don't remember...

I really like the DOF on this one. That with the lines in the bricks really bring your eye around the picture.
I also really like the crisp blacks and the whites that accent the piece.
My only issue with this is the white dot (of sorts) in the upper right hand side. I think it is a distraction for the eye.