SONY 1/3" Super HAD 520TVL High Resolution CCD .
New Optional 8.5mm~51mm 6X Optical Zoom Auto Iris Lens .
RS-485 compatible with Pelco D protocol .
OSD Function through RS-485 .
Built-in Mechanical IR Filter for Brightness up, Extremely Less Noise at Night .
With a gate under housing, and turntable gear wheel for adjusting 5~50mm Varifocal Lens easily .
New Design has a gate under housing for varifocal lens adjustment.