Exercise: Focus at Different Apertures

Here I had to choose a subject that would demonstrate the effect of focus and depth of field through different apertures. The central object would be in focus all of the time, the camera must remain still (mounted on tripod) then by changing the aperture from largest f/1.4 to the smallest f/22 its effects (focus) would be noticeable.

Photo 1

f/1.4-1/4000-400-50mm

Photo 2

f/11-1/80-400-50mm

Photo 3

f/22-1/20-400-50mm

Photos above demonstrate that when shooting with a large aperture the effective area that remains in focus is relatively small and centred around the focal point. When decreasing the aperture number (stopping down) this effective focal area becomes larger and the definition between the smaller 'f' numbers becomes more difficult to distinguish. The smaller the 'f number i.e. f/22 the more "in focus" the entire photo will become.