March 4, 2020 by Peter A A must have lens for your OM-D body!: I bought this lens for the new OM-D E-M1 Mark III. I am upgrading from my old E5 where I was using 7 different four thirds lenses. This lens is a must have for me moving to the lighter, more compact OM-D system. Easily replaces 3 of my old four thirds lenses to light the load. Quality build and the performance is outstanding. The 12-40mm F2.8 Pro lens truly allows me to break free with Olympus!
December 5, 2019 by Albert Equal to a bag of primes: This lens is like a bag of primes and the best wide-normal zoom I ever owned across three different systems. Build quality and IQ is superb with a great manual focus clutch ring. 0.3x close focus magnification is extremely useful and one of the things that sets many Oly Pro lenses apart from other brands. Mates perfectly on a EM1 body. Highly recommended
September 5, 2019 by Tom Great general purpose PRO zoom: I recently made the switch to Olympus and purchased an OM-D E-M1X along with three M.Zuiko PRO f/2.8 zoom lenses. I bounced back and forth between the PRO 12-40 mm f/2.8 and the PRO 12.-100 f/4. I eventually went with the 12-40 f/2.8 to gain the additional stop of light. It was a great decision. This is a fantastic lens... sharp... fast focusing... and versatile. The extra stop of light comes in very handy. When compared to the 12-100 mm f/4... I only gave up 1/2 stop of IBIS performance which is no issue for me.
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September 3, 2019 by Protogonus Hidden Advantage of 12-40mm f/2.8: IR Capability: The hidden advantage of the M.Zuiko 12-40mm f/2.8 lens is its completely acceptable infrared (IR) capability, especially when combined with a suitable Olympus camera body. Actual performance using a customary IR filter shows no "hotspot," which is a problem actually with other M.Zuiko lenses, and no substantial loss of contrast or ghosting, which also is often encountered. Unfortunately, the usual IR lens database (often cited online) is erroneous concerning several Olympus lenses and also fails to list this particular lens. Two online tutorials both demonstrate the IR capability of the M.Zuiko 12-40mm f/2.8 lens but do not point out that not all M.Zuiko lenses are IR-capable.
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September 2, 2019 by Darek Must have!: How many "kit lenses" are f/2.8 and have splashproof construction? this was my first lens purchased with the E-M1 MK I a few years back, and its still going strong after many adventures. All-in-one travel lenses are great, but if you need a faster lens, sacrifice some zoom and get this gem.