Issues affecting the optical path can introduce errors in the results from the AF Sensor, and mechanical issues can change how accurately the lens is positioned, both having a direct effect on the overall sharpness of your final image. There are 3 distinct components of the lens that I’ll look at in this post: Part 2: On-Sensor Phase Detect Autofocus.Part 1: You SHOULD Calibrate your Mirrorless Autofocus!.This post is part of a series looking at on-sensor phase-detect autofocus, the whole autofocus system, and why mirrorless autofocus might still need some calibration. The lens is a huge and critical part of the autofocus system, after all, it actually does the focusing.įar from being a single lump of glass, they’re actually intricate and complex systems of exotic crystals, metal and electronics which are designed to work in harmony to focus light of any visible colour to a sharp image on the camera sensor.Īnd when you have a complex design and a lot of interacting parts, reality can sometimes be a little different to the perfect theoretical design.
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