Shallow depth of field (DOF) is one of the visual effects that many photographers seek in their everyday photographs. To accomplish this, there is the grail quest for lenses with larger and larger maximum apertures. In the world of macro and close-up photography, however, a shallow DOF shot can be the photographer’s nemesis. Large magnification macro lenses often have DOF distances that measure in the millimeters or less! This means that a photo of an insect or small creature might show the eyes in sharp focus, but nearly everything else is a blurry haze.
Depth-of-Field Basics
Before we dive in with macro DOF, let’s get the basics of DOF out of the way.
Depth of field is defined as the area in a projected image, forward and aft of the focal plane, which also appears to be in focus in the image.
Basically, the camera lens is focused at a single distance from the front of the lens and the human eye sees an area before and after that distance in sharp focus. That linear distance before and after the focus plane is the DOF.
The four primary factors that determine DOF are: lens aperture size, lens focal length, the subject-to-lens distance, and a concept known as circle of confusion (COC).
If you want to take a super-deep dive into DOF, please see my three-part series on the subject starting with this article. If you want to stay on this channel, keep on reading.
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