@Camit , but if you need 100 pixels across someone's face for ID purposes, (well lit conditions) based on what I have read, with a 1/2.8 1/2.9 or 1/3" sensor which is typically found on most mid range dahuas or hikvison cameras, having more MP shlould help on dicerning features at a given distance. At least that is what I can gather from the ip camera layout software that us floating around online.
My statement above relates to all things being equal. I think sensor size comes into play or shine in low light conditions. At least that is what I remember from reading in the past.
I am clear that a 5mp camera from ebay will be far less superior than a 2 mp dahua. Based on sensor size and lens etc.
What do you think? I have been wanting to post a thread to ask if it makes sense to install different cameras at the same locations to look at different things since no one camera does it all.
In my case I want good night vision, but at the same time, I want to ID someone approaching my property when im not around (working or out of town). From 10' up and 30' away (lets find the long side of the triange) I think a higher MP camera would give me an advang during the day.
I guess the questions I need to ask, is what is the intended application of the 8mp cameras hikvison and dahua make. It can't be all markering. There has to be some logic.
Btw. I have a 2mp PTZ 4x zoom camera from dahua. No IR unfortunately. and yes at night especially w the zoom it is amazing.
Ps. Going back to apples and oranges, I sent back my reolink and
amcrest cameras. They were 8mp /4k but nothing like the dehauas I have replaced them with.
