Ok I did change the lens and it seems like a normal 3.6mm lens. I replace my ordinary Board IP Camera with Sony img 225 Board Camera and I m satisfied with low light performance in dimly lighted narrow alley. I m just wondering if I replace it with proper lens suited for IP camera will there be any difference in low light ability? Its confusing there is written 3mp in 2.8mm lens and nothing in my old 3.6 lens. thanks.