A Camera was a device for taking still photos.
Harrison Chase used a camera to photograph the Krynoid in the grounds of Chase Mansion. (DW: The Seeds of Doom)
The Fourth Doctor used a Polaroid camera to take a photograph of the soldier in Florence, 1505, and knocked him out while he was distracted by his photographic image. (DW: City of Death)
Fairies could choose whether or not a camera could take their picture. (TW: Small Worlds)
Kazran Sardick kept a camera about him. He used it take black and white pictures of his adventures with the Eleventh Doctor and Abigail Pettigrew. (DW: A Christmas Carol)