Much of the theory is based on some photographs that NASA released. These pictures appear to have either multiple shadows, i.e. multiple strong light sources, or else the single light source casts shadows of objects in different directions, as it would if it was very close.
However, what I did find, were numerous pictures where the depth of the picture varied enormously. Taking only pictures contained on NASA's web sites (
http://www.nasa.gov) there are quite a few pictures where the results are not consistent with other shots taken at the same location.
Some pictures show one or other of the astronauts with a depth of view that I'd estimate at about a mile or so, often with mountains visible in the background. Other pictures, taken in similar locations, have a field of view of about 25 yards - that's total darkness 25 yards behind the subject. I find this a little unlikely.