I am hoping someone can point me in the right direction as I have tried to look at everything I can think of in terms of camera setup. I have four HIKVision IP cameras, all the same model with the exception of focal length, where two are 4mm and two are 2.8mm. The two 4mm camera's display information like date, time, camera name, etc. are huge while the two 4mm are a lot smaller but still legible. I'll post some pictures up from my phone with the Live View on our iPad but the same can be seen on my iPhone...
2.8mm
4mm
2.8mm

4mm
