What you are seeing is not a capture or printing error. The irregular inner concave surface of the moon is due to variations in depth from craters; the moon itself is in the very extremes of Zone X in the actual image, yet there is still tonal separation present in the print.
Following on from my earlier article on pushing print limits, I’d like to show you the fruits our labour: the Ultraprint. I think the above image pretty much says it all: that is a photograph of the actual print, with a ruler for comparison. Scale markings are in millimetres, as shown.
Ming Thein | Photographer 