A free lens calculator and field of view (FOV) calculator built for broadcast television production. Compare every Fujinon and Canon B4-mount lens for ENG, EFP, studio, and sports applications — instantly see which lenses can make your shot.
This lens calculator was built to replace the discontinued Fujinon iOS lens calculator app. Working camera operators need fast, accurate answers about lens coverage and focus capability — especially when evaluating rental lenses before a shoot. Enter your frame width and camera distance, and this tool tells you exactly which lenses work.
All calculations use standard thin-lens approximations with logarithmic focal length interpolation across the zoom range. Internal math is in millimeters; display units convert at render time. Lens specifications are sourced from published manufacturer data sheets.
Built for working camera operators who need fast, accurate framing checks on real broadcast glass before a shot.