A mouse-over will show the dramatic gains made over light pollution by making multiple exposures and stacking the images. One image shows a scan from one frame - compare it to the 7-frame final.

This image is a compilation of seven 20-minute exposures using a Nikon 300mm f/2.8 lens and a 1.4x teleconverter set at f/5.6. This is the maximum time I can expose E200 slide film at this aperture from my suburban back yard. But by layering seven images in Photoshop, I was able to substantially increase the signal to noise ratio, the noise being light pollution. Even though I had 140 minutes of total exposure time, the image has no more detail than what could be made in a single 20-minute exposure from a dark sky.