Which factor does not affect depth of field?

• A. Aperture
• B. Focal Length
• C. Subject Distance
• D. Shutter Speed

Answer: (D)

Depth of field is the portion of the scene that appears acceptably sharp. It’s shaped mainly by three factors: aperture, focal length, and how close you are to the subject. A wider aperture (smaller f-number) creates a shallower depth of field, making only a small area around the focus point sharp. A longer focal length tends to compress the scene and reduce depth of field, so more of the image falls outside the sharp zone. Getting closer to the subject also narrows the depth of field, while moving back increases it.

Shutter speed, on the other hand, governs how long the sensor is exposed and directly affects exposure and motion blur, not the range of sharpness in front of and behind the focus point. You can change exposure with shutter speed, but it doesn’t directly change how wide or narrow the sharp area is.

So the factor that does not affect depth of field is shutter speed.