Here is another example of selective focus. Focal point is the second spindle and this draws our attention to that particular spindle. This is useful when your subject is in the midst of a busy background and foreground. Use a wide aperature (the lower the fstop number, the wider the aperature).
These weeds are in the field behind my back yard. I wanted to use a shallow depth of field to draw attention to the taller wheaty looking weed, the soft focus on the other weeds provides a nice background. Vicki doesn’t like this photo, because there is too much soft focus, most of the photo is out of focus in her words. What do you think?