Chris Eyre-Walker: Olympus 12-45mm f/4 vs 12-40mm f/2.8 PRO vs. 12-100mm f/4 IS PRO May 3, 2020 reviews 0 Comments Chris Eyre-Walker: Today, I’d like to compare three similar Olympus lenses and help you decide which of the three is the best one for your type of photography.