src=" One zoom for every occasion - An Olympus M.Zuiko Pro ED 12-40mm f/2.8 review - MirrorLessons - The Best Mirrorless Camera Reviews
12-40mm 2.8

Date: 04/08/2014 | By: Mathieu

One zoom for every occasion – An Olympus M.Zuiko Pro ED 12-40mm f/2.8 review

E-M10, 1/10, f/ 28/10, ISO 800

One zoom for every occasion – An Olympus M.Zuiko Pro ED 12-40mm f/2.8 review

While for my personal photography I prefer to use primes, I have no shame in admitting that a good zoom lens can be crucial for certain kinds of work. Since my photography assignments are mainly in the events category, it is a natural consequence that the M.Zuiko Pro 12-40mm very quickly became my lens workhorse on my OM-D E-M1.

E-M1, 1/2, f/ 56/10, ISO 200
E-M1, 1/2, f/ 5.6, ISO 200
E-M1, 1/4, f/ 4/1, ISO 800
E-M1, 1/4, f/ 4, ISO 800


The Olympus 12-40mm f/2.8 Main Specs
  • Focal Length: 12-40mm (35mm/full frame Equivalent Focal Length is 24-80mm)
  • Lens Construction: 14 Elements in 9 Groups (Aspherical ED lens, 2 Aspherical lenses, DSA lens, 2 ED lenses, HD lens, 2 HR lense)
  • Focusing System: High-speed Imager AF (MSC) – Linear Motor Drive System
  • Dust & Drip Proof
  • Angle of View: 84 – 30 Degree
  • Closest Focusing Distance: 0.2m
  • Maximum Image Magnification: 0.3x (35mm format equivalent is 0.6x)
  • Number of Blades: 7 (Circular Aperture Diaphragm)
  • Maximum Aperture: f2.8
  • Minimum Aperture: f22
  • Filter Size Diameter: 62mm
  • Dimensions: 69.9, 84mm
  • Weight: 382g


MFT lens build quality at its best

When the Micro Four Thirds system was first being developed, we were used to plastic lenses. Then, releases like the 12mm, 75mm, Lumix 35-100mm and the recent Nocticron 42.5mm proved that MFT lenses could also have a professional build and feel. In this sense, the M.Zuiko Pro 12-40mm f/2.8 is state of the art. When you hold the lens, you get that real nice feeling of something well-built, solid, and durable–a lens that can be trusted for every kind of use.

E-M10, 1/8, f/ 2/1, ISO 200

The 12-40mm has a solid metal build with a metal mount, metal zoom and focus rings. The only plastic element is the inner part of the lens that sticks out when increasing the focal length. The lens is also splash and dust proof which makes it the perfect companion for the OM-D E-M1 or OM-D E-M5 in rough conditions. The lens cap and hood are also very well built. The cap has two inner buttons to quickly release it and the hood has two on the side.

The focus ring has a clutch mechanism that allows you to rapidly switch to manual focus, something seen on the 12mm and also on some Fuji XF lenses. It is very convenient, smooth and precise when turning it.


The zoom ring also has a nice feeling but its smoothness is not consistent. Once you pass 14mm, it becomes slightly harder to turn. It is not a problem of any sort but if you are shooting video for example you might prefer a more reactive zoom ring when you need to quickly change focal lengths.

E-M10, 1/10, f/ 28/10, ISO 800

E-M10, 1/10, f/ 28/10, ISO 800

The lens also has a customisable button on the side that can be easily reached with the left hand. I tend to not use it too much however because not every lens that has it and I would probably end up looking for the same button when using other MFT lenses.

E-M10, 1/13, f/ 28/10, ISO 800

Through the lens: Image Quality

E-M1, 1/500, f/ 11/1, ISO 200
E-M1, 1/500, f/ 11, ISO 200
E-M1, 6/10, f/ 28/10, ISO 800
E-M1, 6/10, f/ 2.8, ISO 800

Given the equivalent focal length of a 24-80mm (full frame format) and its constant f/2.8 aperture, the most important characteristic of a lens like this is its versatility and the M.Zuiko Pro prevails in every sense. From landscape to portraits or macro shots, it offers you everything you need in various situations.

E-M1, 1/50, f/ 56/10, ISO 640
E-M1, 1/50, f/ 5.6, ISO 640
E-M1, 1/320, f/ 28/10, ISO 1250
E-M1, 1/320, f/ 2.8, ISO 1250

The image quality of this lens is so good that I often don’t miss my prime lenses unless I want a faster aperture. The lens has a complex glass structure with high grade optical components that include Dual Aspherical, High Refractive and ED lens elements organised in 9 groups.

E-M1, 1/4, f/ 28/10, ISO 400
E-M1, 1/4, f/ 2.8, ISO 400
E-M1, 1/50, f/ 28/10, ISO 1250
E-M1, 1/50, f/ 2.8, ISO 1250

One of the most interesting characteristics is its close focussing distance of just 0.2m through all the focal lengths. It won’t give you real macro performance but it can let you focus on small objects fairly closely when you need to. To me this is a very important characteristic that I’m always looking for in a lens. During events you might be asked to take a picture of a small object–take the traditional photo of the bride and groom’s wedding rings on a table for example–and that’s where this characteristic becomes important.

E-M1, 1/80, f/ 28/10, ISO 1600
E-M1, 1/80, f/ 2.8, ISO 1600
E-M1, 1/250, f/ 28/10, ISO 200
E-M1, 1/250, f/ 2.8, ISO 200
E-M1, 1/320, f/ 56/10, ISO 200
E-M1, 1/320, f/ 5.6, ISO 200
E-M1, 1/320, f/ 8/1, ISO 200
E-M1, 1/320, f/ 8, ISO 200

The lens is also very sharp through all the focal lengths and at every aperture. As usual, the best is found between f/5.6 and f/11 but the results are great also at its fastest aperture of f/2.8. The lens is very sharp at the centre but also at the corners at all the aperture and focal lengths.

E-M1, 1/800, f/ 56/10, ISO 200
E-M1, 1/800, f/ 5.6, ISO 200
E-M1, 1/25, f/ 28/10, ISO 800
E-M1, 1/25, f/ 2.8, ISO 800

The lens has a seven blade circular aperture. The bokeh with this lens is very good especially when you focus in close on a subject. You get nice and rounded out of focus elements. It isn’t the best lens for a shallow depth of field on a Micro Four Thirds sensor but if you understand how to use it, it can surprise you.

DMC-GH4, 1/100, f/ 32/10, ISO 200
DMC-GH4, 1/100, f/ 3.2, ISO 200
DMC-GH4, 1/3200, f/ 28/10, ISO 200
DMC-GH4, 1/3200, f/ 2.8, ISO 200
DMC-GH4, 1/80, f/ 28/10, ISO 200
DMC-GH4, 1/80, f/ 2.8, ISO 200

The lens also handles flare very well–it is minimal in most backlight or direct light situations. Like every other lens in the MFT system, you might occasionally have to deal with purple flares.

E-M1, 1/1250, f/ 8/1, ISO 200
E-M1, 1/1250, f/ 8, ISO 200
E-M1, 1/800, f/ 8/1, ISO 200
E-M1, 1/800, f/ 8, ISO 200

Through the lens: Performance

In terms of autofocus the lens works really well. With the E-M1 I have never had a problem whatsoever and I have managed to focus even in really dark conditions like a disco. From outdoor shooting to action situations or a fashion show, the lens works very well with the camera.

E-M1, 1/400, f/ 4/1, ISO 200
E-M1, 1/400, f/ 4, ISO 200
E-M1, 1/320, f/ 28/10, ISO 1250
E-M1, 1/320, f/ 2.8, ISO 1250
E-M1, 1/320, f/ 28/10, ISO 800
E-M1, 1/320, f/ 2.8, ISO 800

The AF is good not only with Olympus cameras but with Lumix cameras as well. Being the only wide-angle zoom lens I own right now, I have used it a lot on the Lumix GH4 and the AF is accurate and very fast.

DMC-GH4, 1/250, f/ 28/10, ISO 200
DMC-GH4, 1/250, f/ 2.8, ISO 200
DMC-GH4, 1/125, f/ 32/10, ISO 200
DMC-GH4, 1/125, f/ 3.2, ISO 200

The only limit in using this lens with Lumix bodies is that you don’t have any kind of stabilisation. The 12-40mm doesn’t possess any O.I.S. technology because Olympus bodies have internal stabilisation but Lumix cameras don’t (with the exception of the GX7).

The autofocus motor is also very silent and being a movie and still compatible system, it can work well for video shooting as well.

Thoughts in comparison to the Panasonic Lumix 12-35mm f/2.8

I am sure that many users who want a versatile zoom lens with a constant aperture are wondering whether they should get the 12-40mm or the Lumix 12-35mm f/2.8.

I have had the chance to use both but not at the same time so I cannot make a direct comparison. However my feeling is that the lenses are very close in terms of performance and image quality. The 12-35mm has internal stabilisation so if you own a Lumix body the lens might be the better choice. Otherwise I like the build quality and the close-focussing ability better on the 12-40mm. The latter is a characteristic that makes the 12-40mm a winner.


DMC-GH4, 1/250, f/ 4/1, ISO 400
DMC-GH4, 1/250, f/ 4, ISO 400

In total honestly I bought the 12-40mm because I chose the OM-D E-M1 kit with it included. I knew I needed a versatile zoom lens for my work but at the time, I also thought that I would have used it in conjunction with other primes. In the end, when I work it rarely leaves my camera mount. In May I was away for five days in Dubai for a business travel reportage job and 70% of my pictures were taken with the 12-40mm.

E-M1, 30/1, f/ 11/1, ISO 200
E-M1, 30/1, f/ 11, ISO 200 – Panorama merged in Photoshop

This is proof enough to me that it can quickly become your everyday lens. In fact, I am using the 12mm f/2 less and less not because I don’t like it but because when I work it would be just a double for me.

E-M1, 1/1250, f/ 8/1, ISO 200
E-M1, 1/1250, f/ 8, ISO 200
E-M1, 1/25, f/ 4/1, ISO 400
E-M1, 1/25, f/ 4, ISO 400
E-M1, 1/5, f/ 4/1, ISO 800
E-M1, 1/5, f/ 4, ISO 800
E-M1, 1/15, f/ 4/1, ISO 800
E-M1, 1/15, f/ 4, ISO 800
E-M1, 1/5, f/ 56/10, ISO 800
E-M1, 1/5, f/ 5.6, ISO 800
OLYMPUS mirrorless OM-D E-M1 12-40mm F2.8 lens kit black
  • Current Price: $1,440.00
  • Ends: Jan 25, 2017 5:18:55 GMT

Do you own the 12-40mm Pro f/2.8, and if so, what has your experience been with the lens?

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About the author: Mathieu Gasquet

Mathieu Gasquet is a professional photographer with French and Italian origins. Besides running his own video and photography studio 3Dit Lab, he is also the official photographer for the National Cinema Museum in Turin. You can follow him on Google+, Twitter or Facebook!

  • Mathieu

    I’m curious about the rumored 9mm prime. If it has a fast aperture it could be a very nice complementary lens.

  • Mathieu

    Well maybe a 14-60 f/4 could be reasonably small. Who knows maybe even a 14-90 :)

  • Mathieu

    Yes I agree that button is a great feature. I just “fear” that then I would want one on every lens I own 😀

  • Ulysses

    I’ve shared many thoughts about this lens with my other m43 buddies, some of whom are also E-M1 shooters. This lens makes such a great combination with that body. If I had written a formal review of my own, it would have looked very similar to your own. Very nicely done!

    In my own tests, I’ve found the Olympus 12-40 to be noticeably sharper at the edges than a similarly framed image taken with a Nikon full-frame body and 24-70 lens. It’s surprisingly quick to autofocus. There’s really not much at all to dislike about it.

    I’ve wanted to purchase more wide primes for my m43 system. But I made the “mistake” of purchasing the 12-40 f/2.8 lens first! So I’m a bit ruined now, unless necessity demands wider apertures.

  • Jim Kahnweiler

    It’s been a fine lens for me on the EM-1. Near flawless focus accuracy and tack sharp (ouch!). And rugged. I dropped the rig from about mid-thigh pulling out of my hand when I stepped on my sync cord. Not even a scratch or dent and the camera and lens seem fine. (next purchase: wireless flash trigger).

    I would like to see a 14-60 f/4 MFT with the same build and image quality. I could use a little more reach. Hey, while I’m wishing how about a 14-90 f/4; but that might be too heavy…


  • Anurag

    Great review Mat.

    I agree with you regarding it’s use. I rarely use the 12mm now for my weddings, 12-40 is highly capable. The build quality is on par with the EM1. The EM1 is designed to be used professionally and so is this lens.

    With regarding the button not the lens, it has it’s uses. Not for me much but it can be programmed to provide “back button focus” or AF lock. Very handy for those people looking for such a feature.

    Best regards,


  • Bob B.

    Your review is right on the mark! My experience with the lens exactly. I do use the FN Button. I always have my camera (E-P5 or E-PL6), set up with the smaller focus points…and I use the lens button to snap my point back to center when I have move it. I know when I use that lens that I get that extra treat!
    Great lens.

  • TV How

    Yeah, I’ve had a great time with the 12-40mm! It’s well worth it, for the quality you get. Although a bit larger than the Olympus primes, the versatility it adds makes up for that. On the E-M5, I use it with the JB grip to help balance out the size/weight of the lens. You can definitely shoot without a grip, but I feel the grip adds an extra dimension for your hand, so that your arm muscles are more relaxed when you shoot.

    I had the same opinion of the overlap with the 12mm f/2. The image quality of the 12-40mm was not lacking in comparison. Eventually, I sold the 12mm to get the 75mm. It’s a nice focal length to complement the 12-40mm, but the 12-40mm is really versatile in its own right.

  • Dharma Singh

    OK, you mean: ‘It’s the only one I own that has this button.’
    By the way I don’t use it either :)

  • Mathieu

    Yes but it is one of the few and I don’t own it that’s why I prefer to not getting use to a button that I won’t find on my other lenses. But that’s just me, I’m sure many other users find it useful :)

  • Dharma Singh

    “The lens also has a customisable button on the side that can be easily reached with the left hand. I tend to not use it too much however because it is the only lens that has it and I would probably end up looking for the same button when using other MFT lenses.”

    Not quite true: I own the “poor man’s lens” M.Zuiko 12-50mm 1:3.5-6.3.
    It’s has the same Ln button, as well as a Macro button.

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