Ran a bench test at 940 nm with a 200 mm f/2 collimator and found that adding a 120‑grit ground‑glass diffuser to induce mild speckle tightened centroid stability on a SPAD array over a 10 m path. Has anyone else used engineered speckle as intentional dither in time‑of‑flight optics, or is this likely a lucky interaction with our detector’s pixel response nonuniformity?