Apollo astronauts carried a number of different cameras, some of which had changeable lenses for different focal lengths. The resolution, which are given in arc-seconds (1/3600 degree), is dependent on the camera's focal length, the film used, and to some extent, the contrast of the scene photographed. The resolutions in the Apollo documentations were originally given in lines/mm on the original film - a "line" being the size of the smallest resolvable feature on the film.
This camera had only one focal length and used one type of film.
Image area on film: 115mm X 115mm
Focal length: 76mm
Field of view: 74 X 74 degrees
Film: 3400 (B&W). Resolution: 12 arc seconds
Resolution: 90 lines/mm = 26 arc seconds (at a 1000:1 contrast ratio)
The camera was mounted in a bracket at one of the Command Module's side windows
Image area on film: 52mm on each side for the film types listed below;
Focus: 2.5 meters to infinity;
80mm Focal Length Lens
250mm Focal Length Lens
500mm Focal Length