The Olympus 150-400mm f4.5 Pro is the largest and most expensive micro four thirds lens released to date. It was highly anticipated by wildlife professionals and enthusiasts before the official price cooled the hype. Has Olympus gone too far, or is this a “one of kind” lens that you won’t find elsewhere?
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https://mirrorlesscomparison.com/micro-four-thirds-lenses/olympus-150-400mm-pro-review-vs-canon-800mm/