So generally, I’ve always understood that the lowest ISO is best to shoot at. Though with newer cameras, they usually have a higher base ISO and in some cases Dual ISO.
I usually work with the R5C, even for photography. It feels odd to take portraits at 800 ISO because I’ve always been told it should be as low as possible.
So does the Base ISO system, negate the need to shoot at lowest ISO for the clearest and least grainy image?
ISO is the least important part of the exposure triangle. Always has been. It’s much better to get a sharp image with a little bit of grain than one that is smooth but blurry. If your images aren’t visibly noisy at 800 ISO then stop worrying about it.