Nikon D Series Fine Focus Adjustment Guide

This comprehensive technical guide provides detailed instructions for performing fine autofocus adjustments on Nikon D-series digital cameras, specifically using the D70 as the primary example with applicability to other models. The document covers the complete adjustment procedure including camera setup requirements, mirror locking techniques, and precise Allen key insertion into the AF mirror adjustment screw. Step-by-step instructions explain how to rotate the AF mirror adjustment screw to bring the autofocus point closer or farther from the camera body. The guide emphasizes critical safety precautions to avoid damaging the shutter mechanism located near the adjustment screw. It includes detailed diagrams of the mirror box assembly showing the image sensor, focusing screen, mirror, and AF mirror adjustment components. Reference image comparison methodology is recommended to evaluate improvement or degradation of focus accuracy. This resource proves particularly valuable for users with modified infrared cameras requiring precise autofocus calibration. The procedure requires careful handling and is intended for experienced users comfortable working with internal camera mechanisms.