![]() ![]() Understanding how things work is one step towards being able to diagnose the problem. Before we dive into the tests for backfocus, it’s important that you understand the underlying concepts of flange focal distance, backfocus, and depth of focus as well as why backfocus matters.įlange focal distance is the distance between the lens mount flange and the film or sensor plane while backfocus is the distance between the rear element of the lens and the film or sensor plane.īoth of these distances are crucial to have correct. And with one simple check, you could’ve caught the problem early.įlange Focal Distance, Backfocus, and Depth of Focus Well, many things could’ve happened, but there’s a chance it was the backfocus of the camera you were shooting on. You seat the lens in the mount after a perfect exchange, you hit your marks while pulling focus, and when you see the footage, you’re devastated to see it’s all out of focus anyway. ![]()
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