Hikvision Focal Length Differences
Without a shadow of a doubt, the absolute most frequently asked question we receive is regarding focal lengths, and what viewing angles different focal lengths will offer. For good reason, too - it's a very important decision in the system spec process, and can greatly affect image quality. You wouldn't want to use a wide-angled lens to view a number plate from 50m away because you'd have no hope of reading...
Hikvision Focal Length Differences