Signs the lens needs attention

Soft focus in close-up shots, a halo around bright highlights, or a faint smudge that will not wipe away usually point to dust behind the lens or a misaligned module rather than a failing sensor.

Cleaning and alignment

The module is opened on a dust-controlled bench, the glass surfaces are cleaned with optical-grade solution, and the autofocus assembly is re-seated and calibrated against a resolution target.

Proving the result

Before handover we shoot a fixed test scene at three focal distances and compare the results with the pre-service baseline, so the recovered detail is visible in the corners as well as the centre.