How to enhance the depth of field in photos
Aperture isn’t the only option you have to increase or decrease image sharpness
Focal length
PHOTOS TAKEN at longer focal lengths appear to have a shallower depth of field than those shot using shorter focal lengths. This is down to the narrow angle of view of a telephoto lens. Compared to using a wide-angle lens, you can capture a much smaller area of the background relative to the subject, which makes out-of-focus areas appear larger and softer as a result. Where you stand makes a big difference: tele and wide lenses will give a similar depth of field when the subject is framed at a similar size with each lens.