ConstantChange

Thanks for the replies. That helps a lot.

I'm very green to CCTV, but with the research I've done, it seems D1 is the best quality most DVRs can record. My understanding is D1 is 704 X 480. On YouTube I see video from security cameras that are in 720p - 1080p. Are they using a NVR to get this quality? For example... rHq-bTnKAu4 If most analog DVR's can only record up to 480 lines, what is the reason to get a camera better than 480TVLs if you don't plan to watch it live? Am I not understanding something? I see a lot of pictures comparing 400TVL cameras to 600TVL cameras, but I'm not understanding how they are able to get the 600TVL images when using a DVR that records at D1. Can someone please help shine some light on this topic for me. Thanks!