Rupes Recta (the Straight Wall) is the best known fault line on the moon. This image was made on May 21 which is about two weeks later than the optimum date to photograph this geological feature which is about 68 miles long and 800 feet high.It is not really a wall, but a gently sloping fault line. Long shadows help to accentuate it.
This image was made using a Canon 7D with a Canon EF 400 mm f/5.6 lens and two extenders stacked onto the back of the lens -- a Canon EF 2X II and a Canon EF 1.4X II for a total FL of 1120 mm. I was using a flimsy tripod which made it a challenge to get these images. The moon was at an elevation angle of about 45 degrees which meant that I was shooting through lots of atmosphere and the humidity level was very high which resulted in some loss of contrast, but on the other hand, it also meant that the atmosphere was fairly stable.
This image was made from a median value stack of four of my best images in Photoshop. The image was then up-sized by a factor of two to get this final result.
