Olympus 300mm vs Canon 400mm size and specs comparison. November 25, 2015 reviews 126 Comments Sm.art.graphicstudio sent me this comparison between the soon ot be released new Olympus 300mm MFT lens and the 7500 Euro expensive Canon 400mm lens. Thanks! Like my work and want to support me? Do it for free :) Whenever you go for a shopping just click on those links and buy whatever you want and I will get a small commission for it without you having to pay one single penny extra: Amazon, B&H, Adorama, Olympus US store, FocusCamera, eBay.