Besides acquiring scientific data, the imager functions as the navigation camera. During its approach, the multispectral imager -- a 537 x 234-pixel charge-coupled device with an eight-position filter wheel -- captured more than 200 images of Eros from as close as 3830 km. It also took more than 500 pictures of a carbonaceous asteroid, 253 Mathilde, from as close as 1212 km. The eventual closest approach to Eros could be less than 15 km, resolving asteroid features as small as 3 m.