Customer Requests "Reading Material" To Understand Cameras Before Making A Decision

I've got a customer who is hoping to somewhat educate himself on cameras before looking into quotes for camera systems.

We all know there's a big brave world of information about cameras out there, but I'm hoping some of you guys might have some suggestions or documents that could help me illustrate the important bits.

I don't want to get into pixel density and PPF, but I'd like to have a graphic of some sort that can show picture quality between 2MP/4MP/4k or something similar.

I'd also like to have him be informed of the differences between TVI and IP.

Any other recommendations on what info might aid me in this process would be greatly appreciated.

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