Apollo 8 Hasselblad image from film magazine 12/D - Lunar Orbit. This photo was used in Figure 2-45 (b) of the Analysis of Apollo 8 Photography and Visual Observations (SP-201), which has the following caption:

Equal phase angle contours from 1° to 10° for Apollo 8 frames 2124 and 2125. (a) Frame 2125, (b) frame 2124.

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

A washout, or zero-phase region, can be seen in figure 2-45 (b). The overprinted ellipses are constant phase-angle contours and indicate that the washout, under the conditions of high-Sun and nearly vertical viewing, subtends about 3°. An obvious feature of figure 2-45(b) is the many small, bright craters. A result of importance for visibility is the somewhat contradictory situation in which these steep craters (which should be avoided by the LM) are best seen at high Sun angles, whereas relative terrain heights and slopes are best seen at low Sun angles.