Yes, CAMERAS is a Scrabble word!

Letter values in Scrabble US: C 3, A 1, M 3, E 1, R 1, A 1, S 1.

Is it a valid word?

CAMERAS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

equipment for taking photographs (usually consisting of a lightproof box with a lens at one end and light-sensitive film at the other)
television equipment consisting of a lens system that focuses an image on a photosensitive mosaic that is scanned by an electron beam

Also: photographic camera, television camera, tv camera.