378-800-12 M Plan Apo 1X Objective for bright-field observation in visible rangeLong Working Distances Infinity Corrected Bright Field Inspection High Quality Plan Apochromat Design Flat Image Surface over Entire Field of View Features Model: M Plan Apo 1X Working distance: In Air: 13 11 mm Corrected Wave Length: 436 656 nm N. A.: 0. 025 f: 200 mm P. D.: 95 mm R: 11 m FOV 1: 24 mm FOV 2: 4,8 x 6,4 mm Abbreviations in product table: N. A.: Numerical aperture W. D.: Working distance P. D.: Parfocal distance f: Focal distance R: