Good Morning Gentlemen, I have not entered this forum before so I hope I am conducting this correctly. I am hoping for some guidance on what I suspect to many of you are well understood matters, but as a beginner I am finding it difficult to find what I need to know. I have a canon xm2 and have begun playing with Green Screen recording, with poor results, I have now become aware of the possible significance of colour ratios i.e. 4.1.1. 4.2.2. etc, but do not understand them. I have tried but failed to discover which of the "4.4.4." ranges my XM2 records in, so cannot say if my poor result is because the XM2 is limited, or if I am just doing it wrong. This has come to a head as I am looking at the canon XF100 which says 4.2.2 and claims to therefore be good for Green screen - why and how? Is it possible that someone could shed some (not to technical) light on this for me? I would be most appreciative of any guidance. Yours faithfully, Trolley Ronnie, Cambridge, England.