[StuartDH]

I've got a couple of cameras (unfortunately no birds nesting), but the camera with an f1.2 6mm lens can focus fairly sharp for at least half of the box.

My other camera (not sure what size lens) has to be set up very precise and even just a 1 cm difference in distance from the lens can result in a sharp picture becoming visibly blurred.

So I guess the best thing to do is get a camera with a low f number, because even if I set up the second camera to have a very sharp picture once the nest is built, the chicks would soon look out of focus if they stick their heads up high when feeding.