Depth of Field Study

How much does depth of field change as we get farther from our subject?

Aperture controls depth of field, but distance also plays a significant part. In macro photography we get really close to our subject, but if we are also shooting wide open to get a lot of light, we get a very small portion of the subject in focus. At the other end, wildlife photography could have a distant subject that is mostly in focus at a similar aperture.

We run this using a test pattern placed approximately 8.5″, 16.5″, and 32″ from the camera’s focal plane. The test pattern is set at a sharp angle to the camera, and has markings in 1″ intervals from the center. The blur on the markings at 1″ and 2″ from center will be good comparisons at the different distances.

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