Three hundred images, 15 sec exposure, ISO 6400, Noise Reduction ON, Long exposure NR ON. 25 seconds between images. That puts it at over a 2 hour period. D5100 Fine image, medium size.
""The world is full of obvious things which nobody by any chance ever observes…""
— Arthur Conan Doyle
“The Hound of the Baskervilles”
""Mathematics...
