Exercise - Focus at different apertures

f29
f16
f4.5
As for this exercise, I still used the same objects as I did with previous exercise, a set of book and a set of DVD.
With different aperture setting, f4.5, f16 and f29 (see photos), I can see the area of picture in focus (sharpness)has increased from small area in the front to the whole scene right to the back.

for some reasons I prefer the one with all the area in forcus (f29) because I don't have to guess what it is.