Orion Proximity

This is how a Nikon D60 can capture stars we can't see with the naked eye.

Also, this animation (actually only three photos, but tweened to appear as though they fade in and out) shows how at longer exposure lengths, more and more stars are revealed and captured as pixel data, though are not necessarily bright enough to register as a discernibly different value such that one can actually make them out; that is, the camera will have captured a very dim or distant star, but it will appear so faint in the image you might not even see it.

Unless, of course, you were to artificially increase exposure through editing of NEF data; the brightest (and noisiest) photo in this animation shows how increasing the exposure to 175% original whilst bumping up the black depth dramatically changes the depth and population of the starfield around Orion's belt, a well-documented and highly active nebula.