Imperial fields accept 11'3", 11-3, 11.25, 135in; metric accepts 3.4m, 340cm. Use the viewing area, not the outer frame.

Family filtering prevents cross-mount recommendations. It does not replace an exact projector manual or manufacturer calculator.

Distance is screen surface to the selected lens pairing’s quoted optical origin. Rear-of-body marks are suppressed for folded/UST optics.

Output efficiency covers calibration, lens transmission, geometry and operating mode. Stack efficiency applies only when quantity is above one.

Measured distance ÷ measured image width recalibrates the real throw ratio and tells the crew exactly how far to move.

The solver intersects real lens ranges with the legal placement zone, then ranks the safest zoom position—not merely the first lens that fits.