Forum:Could Gandalf see the ringbearers?

Hi there, I don't know if this is what the forum is meant to be used for, but this was the best place I could find.

Anyway, my question is about the Maiar, but Gandalf in particular. As far as I know, the Maiar are a sort of lesser Valar, they were spirits who didn't have a physical form, the Ring shows only your spirit form, so that's why Sauron doesn't become invisble. But if they're spirits, does that mean they can see wraiths like the Nazgûl in their natural form, they are after all just invisible, you can only see them with the Ring on, because it shows you the wraith-world. My question is, if Gandalf is a wraith, but with a physical form, could he have seen the ringbearers while they were wearing the Ring.

I could be completely wrong about all of this, maybe this isn't the right place either but I didn't know where else to ask.