540 high resolution CCTV Camera

Our all the 520TVL CCTV Camera have to the higher 540TVL .  the main technology renovation is SONY 6 series CCD what we using SONY ICX639AK(PAL)/638AK(NTSC) CCD+SONY CDX3172 DSP instead the old SONY ICX409AK(PAL)/408AK(NTSC)CCD. the image is more clear ,the function works well .