I'm teetering from one to the other and need to know how much difference there is between them in low light conditions. I know that the 120 is 1 lux (good) and 70 is 12 lux (not so good), but the 70 has a built-in light, focus ring, and comes with a crappy little external mic. I don't want to sacrifice too much picture quality, but really how much better is 1 lux compared to 12?

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