These 1200tvl cams are 1st of all supposed to be wide angle. I disagree with that claim for one reason, there is absolutely no distortion that a typical fisheye lens for wide field of view would create. Also I get a wider field of view with my cell phone. Next, if these cams are 1200 tv lines, why do the specs in the manual do not exceed 700 on any models listed? (See photo ) And if - these cams happen to be such high res. you wouldn't be able to tell over the noise being produced. Not sure if it's ground loop or high frequency interference but I tried different power source combinations which made no differences.Specs say "S/N ratio-more than 48db) Oh well, another miss for me. Will send back and start over, again! I will make it 3 stars if I can return with no hitches. I have to pay to ship for something I did not order, agan. I will promptly contact Amazon. Update... Seller refunded me $9 for shipping. Cams come from China. Seems like there is always a problem with 3rd party sellers.
P.s. the dnr does reduce allot of noise but there is still considerable amounts of horizontal aberrations after dnr and any other adjustments that can be made.