Olympus’ Monster Telezoom Is Here!
that couldn’t be done – at least in practical terms – with a sensor any bigger than Micro Four Thirds, but Olympus had gone all-out to make the most of the 1.97x magnification factor. The much-awaited M.Zuiko Digital ED 150-400mm f/4.5 a constant aperture of f/4.5. If you then engage the built-in 1.25x teleconverter, you get 375-1000mm for the loss of two-thirds of a stop of speed… so the constant aperture is now f/5.6. That's some lens!
