MODEL CHK -789 CHK -782 CHK -782S CHK -783 CHK -783S Pick-up device 1/3 Sony 1/3 Sony 1/3 Sharp 1/4 Sony 1/4 Sharp Number of pixels PAL:752(H) 582(V) NTSC:512(H) 492(V) System signal NTSC/PAL Horizontal resoltion 480TV Line 420TV Line Minimum illumination 0Lux/F1.2 Lens mount 6(4/8/12)mm (Optional) Backlight compensation Auto(optional) Electronic shutter Auto 1/50(1/60)~1/100,000sec AGC on/off(optional) White balance Auto(optional) S/N ratio >48dB Gamma correction >0.45 Operation temperature -20degree~50degree Sync system Internal Video output 1.0v p-p/75ohm Power consumption DC12V,<500mA weight(g) 128(D) 107(L)mm Dimension (mm) 180(g) IR view distance 20M