So, a user in a different thread brought to my attention a certain video blogger who makes videos explaining basic concepts of photography. He's just plainly wrong in many aspects, and while I'd usually just let it go and not care, he has lots of views, and people are taking him seriously, so I feel like we should explain where he's wrong. Here's his channel: https://www.youtube.com/channel/UCDkJEEIifDzR_2K2p9tnwYQ He mixes concepts like bokeh and focus breathing, and light gathering ability and depth of field, so it's rather important to set the record straight. Use this thread to discuss him and his wrong ideas, or any other concept you don't fully understand, and we'll try to explain it. Collective intelligence at its best.