You can set how far away from the camera the focused portion of the image should be, using the following steps:
Look at the Layers controls in the 3D View header. The sky is in Layer 10. Press Shift + LMB over Layer 10 so that Layer 10 is no longer visible.
Press Shift + LMB twice over Layer 11 to make it the active layer. Layer 11 has the cameras.
With the cursor over the left-hand 3D View window, press 7 on the NumPad and then press the . (period) key on the NumPad to center on Camera.Depth of Field and the house. Move the cursor to where you want the center of the focused area to be. Press the LMB to put the 3D Cursor there.
Once again, if you want to zoom in, you can press Shift + B and then use ...
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