One of my readers sent me this link… http://www.flickr.com/photos/30588268@N03/3638564719/sizes/l/in/photostream/
A simple, but effective illustration of various focal lengths in the same scenario. This image, for new DSLR photographers especially, can help to make sense of “150mm” vs “50mm.” This image illustrates the real world difference. There are many other great images in the same photographer’s gallery, as well.