Nikon non-AI, AI and AIS manual focus lenses. What's the difference?

We explain the differences between Nikon's manual focus non-AI (or pre-AI), AI and AIS lenses; 0:00 Introduction 0:46 Nikon non AI lenses 1:35 Nikon AI lenses 3:31 Nikon AIS lenses If you are buying secondhand AF or AF-S lenses you'll find this video more useful; https://youtu.be/KFICvE7rzkc Please check out our other Nikon videos: https://youtube.com/playlist?list=PLDp3xUadZbAAaAl7QEulzFDoauEcKoMJP Jonathan Harris