Which aperture setting results in less depth of field?

Which aperture setting results in less depth of field?

• A. F4.0
• B. F8.0
• C. F2.8
• D. F5.6

Answer: (C)

Opening up the aperture (using a lower f-number) makes depth of field shallower. Among the options, the smallest f-number is f/2.8, which is the widest opening here, so it produces the least depth of field. That means more background blur and a narrower plane of sharp focus. The other settings use higher f-numbers (f/4.0, f/5.6, f/8.0), which correspond to smaller openings and increase the depth of field, keeping more of the scene in focus. In practice, choose f/2.8 when you want a blurred background for subjects like portraits, and f/8 or higher when you want more of the scene in sharp focus, as in landscapes.

Opening up the aperture (using a lower f-number) makes depth of field shallower. Among the options, the smallest f-number is f/2.8, which is the widest opening here, so it produces the least depth of field. That means more background blur and a narrower plane of sharp focus. The other settings use higher f-numbers (f/4.0, f/5.6, f/8.0), which correspond to smaller openings and increase the depth of field, keeping more of the scene in focus. In practice, choose f/2.8 when you want a blurred background for subjects like portraits, and f/8 or higher when you want more of the scene in sharp focus, as in landscapes.