Olympus 12-100mm f/4 IS Pro Back in 2013 alongside the E-M1, Olympus' first Zuiko Pro lens, the 12-40mm f/2.8, made its debut. This 24-80mm-equivalent lens gained a telephoto counterpart some time later in the form of the 40-150mm f/2.8. These two optics made for a rather versatile combination that provided a constant f/2.8 aperture over a range of 24mm to 300mm equivalents. The downside with that setup was you had to carry along two lenses to get that range of focal lengths. If you'd like to have a single-lens solution, but...
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