Similarly, a lens and camera system that is knocked, or used intensively may lose accuracy and require recalibration. Modern camera and lens systems have sophisticated autofocus systems but many people are unaware that each camera and lens is manufactured and tested to be within an “acceptable margin of error” and this “acceptable accuracy” can be shockingly off. Free Lens Autofocus Calibration Card - Free Download and GuideĬonsistently achieving sharp and accurately focused images is a priority for any professional or aspiring photographer.