Patrick V. answered 09/03/19
Cinematic Writing for TV, Film and Theatre
ANY camera is a good camera for filming documentaries, or anything really. The full length feature film, TANGERINE, was filmed entirely on an iPhone 5s.
Actually, this is a great question because more important than your camera at this point is your AUDIO equipment. Nothing ruins video faster than audio issues. TANGERINE was NOT created using the Audio picked up by the iPhones! If you really want to start producing viable content then use your phone with some decent audio equipment. It is affordable.
The thing to remember about Documentaries or even so-called Reality TV is that they are all planned and all have scripts to work off. There is no real-Reality TV other than the news and even that has a script.
Everything you see on TV is planned to the smallest detail.
It is always about the writing.