Photography ... astronomy ... art ... design ... technology
(... and the odd rant)

All of these make my world go 'round, to some extent, and they will all be found here at some time or other. Some of the photography can be purchased from my Redbubble site. I can also be found at Tempus Fugit (no longer being updated).

Tuesday, October 20, 2015


A bright, clear crescent Moon did shine down last night, and with a young man interested in seeing through the big scope, I stirred myself to grant his wish. While looking at the ancient surface, I noticed that the seeing was pretty good, so got the camera mounted for a few snaps.

There's nothing groundbreaking about a pic of the crescent Moon, of course, but it's always pleasing and never looks the same twice—unless you wait a long time and look at every possible opportunity. On this occasion though, there was a pinprick of light inside a large crater, evidence of day breaking upon a central mountain peak ... and who doesn't like a mountain sunrise?

The telescope is effectively acting as a 1200mm f8 long lens, which is pretty big on a crop sensor camera (Canon 40D). At ISO-400, the exposure would be reasonably short, except that I wanted to make the most of that little sunlit mountaintop, so took exposures of 1/13, 1/25, 1/50, 1/100 and 1/200 second, to get detail in both highlights and dark areas near the terminator (the day/night boundary). I then combined all 5 exposure levels to make an HDR image.

The southern highlands, at top, appear more heavily cratered as they haven't been overlaid with lava,which process produced the dark 'seas' in the northern hemisphere.
Maurolycus, with central peak lit

The crater trio Catharina, Cyrillus and Theophilus, beside the Sea of Nectar
Sea of Tranquility; Apollo 11 site circled


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