A solargraph taken at the University of Hertfordshire’s Bayfordbury Observatory featuring 2,953 light trails of the sun’s movement captured over eight years and one month. The apparatus comprised a pinhole camera made from a beer can attached to one of the observatory’s telescopes by student Regina Valkenborgh in 2012, then forgotten. Valkenborgh sez of it:
It was a stroke of luck that the picture was left untouched, to be saved by David after all these years. I had tried this technique a couple of times at the Observatory before, but the photographs were often ruined by moisture and the photographic paper curled up. I hadn’t intended to capture an exposure for this length of time and to my surprise, it had survived. It could be one of, if not the, longest exposures in existence.
Fancy having a go yourself?