In camera manufacturing, an active alignment process is used to align the optical axis of the lens with the sensor axis of the camera. The active alignment process reduces the spatial frequency response (SFR) corner-to-corner imbalance that causes SFR differences at image corners. The active alignment process is typically carried out with the object at the infinity position with respect to the lens. As a result, in auto-focus cameras with movable lenses, higher SFR corner-to-corner imbalance persists in macro positions. The techniques of this disclosure involve applying the active alignment process at infinity and at macro positions to distribute SFR corner-to-corner imbalance between the two positions.
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Ko, Jamyuen and Wan, Chung Chun, "Active alignment method to dual balance camera spatial frequency response", Technical Disclosure Commons, (June 04, 2018)