<< Thanks because BNC connectors are a legacy feature from the days before the DB-15 connector became widely accepted as the VGA standard. Today most DB-15 video cables use the same 75 Ohm mini coaxial cable as found with the BCN connectors. .
With any connector (BNC or DB-15) there is a possibility of an impedance miss match that could send ripples up and down the video cable. The ripples can be amplified by the video amp and show as shadows or ghosts after light to dark or dark to light transitions on the screen.
Most manufacturers are taking the connectors (BNC and DB-15) off the monitor all together and permanently attaching the cable to the monitor. By doing this they can solder the cable wires directly to the video amplifier board inside the monitor, effectively eliminating any chance of impedance miss match on the monitor end from a connector. An added benefit to a permanently attached cable is, you will never loose it, should you move your system. In any scheme there are trade off. The trade off in permanently attaching the cable is that if the cable should go bad, you need to send the entire unit in for service. My experience says that occasionally cables do break, but the failure rate of cables is very low.
Even if you use a BNC cable, the end that attaches to the video card is still the VGA DB-15. The impedance mismatch at that end of the cable can cause the same types of ghosting affect. If both sides had BNC connections then there would be some improvement. Someone much wiser than I said, it doesn?t make sense to anchor a bridge in concrete on one side and tree vines on the other. >>
OK, but just so you're aware, I'm not complaining, since my VGA signal was excellent to begin with. (Shadow mask Samsung 950p with ATI Radeon LE.) No ghosting whatsoever, and the text is not blurry. (The VGA cable came with the monitor.)
I was just trying to say that it seems to me if that the hardware and cables are good and well-matched, it's not worth spending the extra coin on a pseudo-BNC cable (ie. not the 5-wire cable on both sides).