Micro Four Thirds has a 2x crop factor, which means a 300mm lens is actually a 600mm equivalent. That gives you twice as much reach as a typical full-frame lens.

Nothing about the Four Thirds image sensor actually measures 1 and 1/3 inches, but the idea that two 2/3-inch sensors put together equals a 4/3 sensor fits nicely with the 4:3 aspect ratio.

With an equivalent focal range on the micro four third (M4/3) sensor cameras for which it was designed of 300-1200mm (thanks to the 2x crop factor), the M.Zuiko 150-600mm can deliver as much ...