Was just using the RED as a system that very much hinges on native ISO. DSLR's are up for debate, like I said before there's a tradeoff with canon DSLR's. But as Dingosean mentioned, you're really not going to have any issues at low ISO on a sunny day. That all being said, I know it's easy to just throw small stuff like this under the bus, but if you (or anyone) want to go further in a subject like photo/cine it's important to know those small things.
Native ISO effects almost all CMOS cameras to an extent. it's a type of thing that is independent to each camera too, so research helps. But chances are, there's other things you can do or should be on the lookout for that will make more of a difference than native ISO, assuming you're shooting very low.
sorry to all for nitpicking about this, I just happen to be particular I guess haha. It's a great habit to be on the lookout for small things like this with every camera you pick up too as it can make more of a difference depending on your setting for sure.