Shuttle Fuel Tank Camera.
Page 1 of 7.
The two photos on the next page were taken from a camera mounted on the external fuel tank, looking up under the shuttle.
Note the triagle of the shuttle mount, which is prominent in the page 2 photos.
Nasa photo source:
Thanks to Flickr member, goffarx, who started with a question in the comment, below, and then searched around and found a better source address than I had been using.