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Is your lens back- or front-focusing? Don’t despair, you can calibrate the lens without expensive and complicated tools. Here is how to calibrate lens autofocus.
Karl Taylor posted a short video where he explains well how to proceed to calibrate your lens. He says:
Have you ever noticed your lens isn’t always pin-sharp when using autofocus? This lens autofocus problem can happen because lenses can drift over time. You want your autofocus to be pin-sharp – I demonstrate how to simply calibrate your lens autofocus without needing to buy a lens calibration tool or calibration chart.
All you need to accomplish it is:
And here is the 5 minutes video explaining how to calibrate your lens:
More tips and tricks are listed here.