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Help choosing camera focal length

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Hi,

I'm looking at installing cameras and buying the relevant equipment.
I know what I'm getting for my NVR and am going for hikvision bullet cameras but unsure on the 2.8 or 4mm options.

The front of the house needs to overlook the driveway as in the photo. Im thinking 2.8mm?
The camera in the porch at the door I'm thinking 4mm?

Round the back of the house I need a camera looking at the rear back door and patio doors. I'm thinking a 4mm here?

What do you think.

Many thanks in advance.

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