DV Info Net - C100 colorsampling 4:2:0

For 95% of the time, it's not a problem - I'm sure you'll hear many people say the same thing. It's such a joy to shoot with in its basic state, there has to be a very good reason to saddle it with an external recorder.

There are some shades of red that do seem a bit troublesome.

There's also 5DtoRGB which does a bit of chroma 'restoration' which can reduce some of the worst effects if your shot does end up with jaggies.

'Best practice' would recommend a Ninja or similar for chromakey, but for fairly straightforward well-lit corporate talking heads, I've found no difference in ease and quality of keying between the internal and external recordings as most chromakeyers (e.g. Motion/FCPX, Keylight in AE, etc) are 'hybrid' keyers, using the luminance channel to create an edge key and thus work round the low resolution chroma signal. However, if the job needed translucency, complex stuff like fly-away hair or surfaces that pick up lots of spill, I'd be using the extra strength of the 422 colour. Or even a different camera.

However, I have a slight concern over how the encoder treats high levels of motion in very detailed scenes (the usual suspects - including water, smoke, trees in wind, high gain noise). But then, I have a Pix 220, which doesn't play as nice with the C100 as the Ninja does, which may explain why my '95%' figure above isn't more like '90%'.