Overview The Nikon Inspection and Adjustment Program (commonly abbreviated NIAP or referred to as "inspection and adjustment") is Nikon’s official service workflow and set of procedures used by authorized repair centers to test, calibrate, and restore cameras and lenses to factory specifications. It covers diagnostic checks, mechanical and electronic adjustments, firmware updates, image-quality calibration, replacement of worn parts, and final verification. NIAP is applied during routine servicing, warranty repairs, and out-of-warranty maintenance to ensure optical alignment, exposure accuracy, autofocus performance, mechanical reliability, and overall image fidelity.