Recent removal ==   I took out the following passage:  Barlow lenses have an unfortunate reputation in some quarters due to poor results given by the Barlows included with some inexpensive telescopes.  These results, however, are perhaps better attributed to poor optics and shaky mounts permitting less practical magnification in these telescopes than to an inherent failing of Barlow lenses.  While the entire article is uncited, this bothered me especially, since all the weasel-wording makes it sound like someone's OR.     == 