# Is a charged-coupled-devices tag okay? If so, what would be good usage guidance for it?

I've just added the new tag to How often are electron-multiplying CCDs used in telescope focal planes? Will Nancy Grace Roman be the first use in a space telescope? since that's the primary target of the question. I think we've had several questions before that are primarily about how CCDs work and how they are operated in astrophotography situations.

I did not add it to its companion question Why does Nancy Grace Roman = 100 × Hubble? Why is the new space telescopes wide field camera so much wider than the old one's? because while it involves what's at the focal plane, it's not specifically about the design and operation of charged-coupled devices.

We don't have a focal-plane or instrumentation tag, and seems to general and more about a larger assembly than a CCD and its associated electronics.

Shall we keep this tag? If so, what would good usage guidance for it be?