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Light-Gun Calibration Guide
Diagnose device, desktop, emulator and game-service calibration, aspect ratio, overscan, offsets and multi-player problems.
Last verified August 26, 2026 · Review every 6 months
About this guide
Diagnose device, desktop, emulator and game-service calibration, aspect ratio, overscan, offsets and multi-player problems.
6. Calibration and maintaining line of sight
Calibration solves the difference between camera optical axis, molded sights and the actual barrel-to-screen ray. A robust procedure uses the player’s normal distance, stance and sight picture. AimTrak’s guide explicitly tells users to calibrate in their normal shooting position and notes that distance, tilt, bar visibility and bright point sources affect results.[1]
Typical transforms:
- two/three-point offset and scale for simple bar systems;
- affine correction for scale, translation, rotation and skew;
- four-point projective correction for quadrilateral markers/borders;
- optional distortion correction for wide/fisheye lenses.
A calibration can be mathematically valid yet feel wrong if the player changes stance, if screen aspect/viewport changes, if an emulator adds borders, or if the reference is occluded. Border systems can reacquire screen geometry continuously; marker systems can retain a calibration but still require all expected markers to remain visible.[2][3]