Some max 5 problem

Hi, 2 max topics in 2 days. Dont get angry please. :stuck_out_tongue:
I was working with a scene i made. And i have 2 problems that i worked hard but couldnt solve.

  1. I applied depth of field, but the part that must be blurred is blurred ok, but so pixelish. I want it be better quality one. I played with numbers but no answer.

  2. I couldnt drop shadow to the plane. I put light and turned shadows on…no. Applied brazil Global Illumination, no effect. I mean the shadows of the pieces fall to the other pieces but not to the plane.

Can someone help me?