Using the official weights from the Four Thirds website, I compared the weights of the Olympus 12-40mm f/2.8 with the three fixed focal length lenses that most closely match its zoom range, the 12mm f/2.0, 25mm f/1.8 and 45mm f/1.8. The weight of the 12-40mm lens is 382g. The combined weight of the former three lenses is 383g (130g + 137g + 116g), which is only trivially heavier than the single zoom. Interestingly, therefore, on weight grounds alone, there is no (non-trivial) advantage in the zoom over the set of fixed lenses (the combination of wide, standard and short telephoto to which some people refer as a "trinity"). If using other lenses (the Olympus 17mm f/1.8 or Panasonic 14mm f/2.5 instead of the 12mm f/2.0 or the Panasonic 20mm f/1.7 instead of the Olympus 25mm f/1.8, for example), a considerable weight saving can be achieved. For example, the Panasonic 14mm f/2.5 (55g), the 20mm f/1.7 (87g for the new version) with the Olympus 45mm f/1.8 gives a total weight of only 258g, a whole 124g lighter than the zoom, and anything from a half to just over a stop and a third faster. I do not mean to suggest that weight is the only factor of significance, of course: far from it - the abilities to change focal lengths without changing lenses and select any intermediate focal length are of very great value indeed, and the zoom is weather sealed, of course. Still, it is interesting to note that weight alone is not a good reason to choose the zoom over a set of three fixed lenses giving approximately equivalent coverage (although the position is different if one instead makes it four or five, adding a 17mm and/or 14mm lens for intermediate coverage).