I find CCTV is being installed by more and more numpties that either specify the highest spec they can ie 4k fixed 2.8 in s small corridor, or down the side of a building where a decent 4mp with the right lense will do a far better job, under spec the HDD 1tb, place cameras in the wrong place so they only capture the tops of peoples heads, and never change the settings like BLC or WDR.
Im up against two mongs now in a school with a camera in each corridor about 2m wide by 10 to 15 m long, they specced 3.5 lenses do you think they will mount them all sideways to get the best view? The customer tells me that they have specced much higher resolution than me. Its hard trying to explain to someone that knows nothing about CCTV , that although when on paper it looks better but they are using a sledgehammer to crack a nut, and the usefulness of whats produced will be okay so long as you dont mind eating crushed shell with your nut.