Question : I am mostly ignorant about video matters, can someone explain the interest of a 1DC camera versus a C300/C500 dedicated video camera?
No irony here, just an honest question, I don't understand the advantage of a DSLR for pro video.
Without thinking too deeply, 2 obvious advantages:
1. It's a fantastic stills camera as well (effectively a 1Dx)
2. Full frame sensor would be an advantage if you want very shallow DoF, and it will work well with EF lenses
On the other hand, the C100/300/500 have XLR ports etc, making them much better for audio