Model Focal Length(mm) Back Focal Length(mm) F/NO Construction Component- Element Document Size Max Image Size Max WLBA - 1 24.74 20.54 3.9 3 - 3 83mm 27.92       Objcet-Image Distance (When m=1) Half Angular Field of View Magnification lllumination(%) Resolution Barrel Size (Ø18/15.5) (mm) lp/mm S M 136.84 23 -0.3168 73% 35 50 50 Ø18/15.5