I looked at the four images on my monitor and they all look exactly like digital images displayed on a LG Flatron monitor. And now that I think about it, all the images from the APUG Gallery also look exactly like digital images displayed on a LG Flatron monitor. That's interesting (not). Aside from the obvious differences, displaying digital representations of traditional work on a computer monitor is misleading at best. And as Chris has alluded to, he could have posted four digital images from a digital point-n-shoot.
Would I publish information about the equipment used in a book/publication? It depends on the purpose of the image in the book.