Focus with set aperture

The exercise involved taking some pictures of the same view from the same place using the widest aperture but changing focus points.

Tried with 18-55mm lens and lowest f-stop but it didn't work very well; there was not enough distinction between the blurred and non-blurred.  Then tried with zooms lens and got some effective results. I took three pictures of the same view at the same length (55m) and same aperture (f/4).  Note the photos look blue as by this time, the light was fading fast and my white balance was set to cloudy.  But you can see the difference between the blurred and non-blurred.

DSC2048: focused on first car; rest of image blurred
DSC2049: focused on second car; foreground and background slightly blurred
DSC2050: focussed on third card; first car blurred, second car slightly blurred and fourth car slightly blurred.

I prefer the effect in DSC2048 with the rest of the background blurred; this would be good for portraits.  But which focal point you used would depend on what you were trying to photograph and wanted to express.

DSC2048

DSC2049

DSC2050