I recently came across an image of Vallis Alpes on the moon (Alpine Valley) created by the Lunar Orbiter 4 space craft in 1967. It struck me as amusing that my own image taken in April of 2013 compares favourably with the Obiter’s image.
The Orbiter’s altitude varied from 2,100km to 6,000km so I nominally choose 5,000km as the distance of the Orbiter’s image. The mission cost in 1967 was $163m US. In today’s dollars (2015) that works out to about $1,2 billion.
My equipment is a little less expensive and i was about 371,000 km way when i took the image.
To be fair, there is a lot more detail in the orbiters image. For example, the rille (trench) running down the middle of the valley is between 700 and 1,200m across. This detail can just be seen on my image, while it’s quite clear on the Orbiter’s image and even shows the details of some small craters that impacted after the rill was formed.
My image of Vallis Alpes is a close crop to a much a larger image of the area including the crater Plato and the top mare Imbrium.