Review: "Lenses like this one have often been called "vacation lenses," because they're perfect for times when you just don't want to hassle with lugging along a whole kit of lenses. The range of 28-300mm went from a pretty wide angle to a longish telephoto back in the days of film, but with current sub-frame DSLRs, the 28mm wide angle end translates into only a 42-45mm (depending on your camera) focal length, just slightly wider than what's considered normal (that is, neither wide angle nor telephoto).
..Bottom line, this Tamron 28-300mm f/3.5-6.3 could be a good choice if you do a lot of shooting from 35-70mm, with only occasional excursions out to the 300mm limit, and/or if you tend to print many of your shots at 5x7 inches or below."