This pages shows the same image taken at f/2, f/4, f/8; three frames, with each frame doubling the depth of field of previous frame.
This demonstrates the effects achievable at each aperture, and shows why shooting at f/2, might be your best choice with some subjects, in order to isolate the subject. It also shows how pleasing the 200/2L IS remains when stopped down.
Already at f/4, the subject competes with a distracting background. The added depth of field of f/4 or f/8 does nothing for the image except to make it visually distracting. An f/2.8 lens would strike a middle ground, but would not afford the same possibilities.
Click to view the series for a large screen (30").
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