Philip Johnston, he of HD Warrior, shares some of his reasons why he bought his Canon C300. The minimum format demanded by the BBC is 50mbps 4:2:2, which is exactly what the camera records. So, he’s covered without external recorders, which is very important to him. He worries about always making sure whatever external recorder he was using was still working, since there is no feedback in the viewfinder on other cameras. He has had the same problem determining lens iris position in the past.