The FDC Multi is a precision optical flange depth measuring device designed for digital cinema and broadcast cameras. It projects a red/green bar pattern for micron-level alignment with ±3 µm accuracy and a ±0.2mm measurement range. Supporting fixed value targeting and delta-based calibration modes, it works with PL, LPL, EF, RF, E, F, MFT, XPL, and Leica mounts via adapter rings. Powered by a CR 1/3N battery or 5V DC, its CNC-milled aluminum housing ensures durability. User-selectable flange reference distances (52.00 mm/44.00 mm) enhance versatility across camera systems.