Model BS-851A BS-851F BS-851I Pickup device 1/3-inch Sony CCD 1/4-inch Sony CCD 1/4-inch Sharp CCD Number of pixels PAL:512(H) X 582(V) NTSC:512(H) X 492(V) System of signal PAL/NTSC Horizontal resolution 420TV Lines Minimum illumination 0Lux/F1.2(IR Open) Lens mount Built-in 6(8/12)mm (Optional) Built-in 3.6(6/8/12)mm (Optional) Backlight compensation Auto Electronic shutter 1/50(1/60)~1/100,000sec AGC Auto White balance Auto S/N Ratio > 48dB Gamma correction > 0.45 Operation temperature -20degree~50degree Sync system Internal Video output 1.0v p-p /75 ohm IR view distance 8-12m Power consumption DC12V,<= 250mA Dimension(mm) 85(L) x 49(D)/I CASE     104(L) x 64(D)/II CASE Weight(g) 207(g)/I CASE             330(g)/II CASE