File:AS08-12-2148 (21444405684).jpg

Apollo 8 Hasselblad image from film magazine 12/D - Lunar Orbit.
This photo was used in Figure 2-35 of the Analysis of Apollo 8 Photography and Visual Observations (SP-201), which has the following caption:

Apollo 8 frame 2148, showing zero-phase point.

The text of the Analysis refers to the figure as follows:

An isodensity trace of the zero-phase region of Apollo 8 frame 2148 (figs. 2-35 to 2-37) shows that the photometric function increases much more sharply with decreasing phase angle than was previously believed. Lunar reflectivity is about 20 percent higher at zero phase than at a 1.5° phase angle. An approximate curve is shown in figure 2-38; these results are subject to later refinement.

This photo was used in a figure in Lunar Photographs from Apollos 8, 10, and 11 (NASA SP-245), 1971. It has the following caption:

This vertical photograph of the northern floor of a far-side basin was exposed near the subsolar point (point of maximum Sun elevation). The unnamed bright crater at center is the focal point of the scene; thousands of tiny craters stand out as pinpoints of bright light.