Hi Artie, n the meantime, though, I can point you to this article which describes the effect and does include an image example:
http://www.bobatkins.com/photography...ound_blur.html
As explained in the referenced article, the "fuzzier" distant background comes from the fact that that a longer
lens at the same f/stop setting as a shorter lens will use a larger physical aperture opening at
time of capture. It is technically this larger physical opening which creates the effect rather than
the focal length itself but since for a given f/stop setting, the physical opening size increases with
focal length, you can state it either way. I'd also be interested to hear what others have to say about this.
P.S.
Sorry for getting into this technical sidetrack in your image critique thread.