(click for larger image)
According to the EXIF data this picture of the moon was taken on 2011/11/6 at 20:10 hrs with a SONY NEX-5 and a Leitz Summicron 50mm f/2 lens. The exposure was 13 sec, with the gain set to +2EV at ISO 1600, equivalent to ISO 400. I don’t have a record of the aperture, but it was probably stopped down to prolong the (automatic) exposure. No tripod.
Here are some light paintings made with the same method, but aiming the camera along the horizon to catch photons from shops, cars, and street lamps.
(click for larger images)
Excercise: Why do the latter three ‘light paintings’ contain many segmented lines whereas the moon picture is made up of smooth continuous lines? What determines the length of these segments? Exposures for these three images were (6 sec, 3.2 sec, 3.2 sec) respectively.