Format: 1/1.8" Focal Length:3.5mm Aperture:F2.4 Iris Type:Manual Iris Mount: C-Mount Additional Information 2 Megapixel Rated, Low Distortion (0.46%), Locking Screws (Focus and Iris), Also referred to as P/N LM3NC1M in some Kowa literature. This lens model was originally marketed as 1/2" format, but has recently been changed to 1/1.8" format after having tested successfully to cover this larger sensor size. Focal Length (mm) 3.5 Lens Type Fixed Image Size (mm) 1/1.8" (?9) Iris Range (F-stop) F2.4 ~ F14 Focusing Range (m) 0.1 ~ ? Iris Control Manual Focus Control Manual Shooting Range at M.O.D. (mm) 201(H) x 151(V) Angle of View 1/2" (°) 82.4 x 66.9 Angle of View 1/3" (°) 66.9 x 52.7 Angle of View 1/1.8" (°) 89 x 73.8 Resolution (Center, Corner) 120lp/mm, 100lp/mm TV Distortion (%) -0.5 (1/1.18") / 0.4 (1/2") Back Focus in Air (mm) 9.02 Mount C-mount Filter Thread Size (mm) M40.5 x P0.5 Minimum Focus Distance (m) 0.10 Size (mm) ?42 x 38.2 Weight (g) 85 Temperature Range (°C) -10 ~ +50