Olympus M.Zuiko Digital ED 75mm f1.8 Review
The M.Zuiko Digital ED 75mm f1.8 is a premium lens recently introduced in May 2012 by Olympus for the micro 4/3 camera mount. Olympus characterize it as a “ high-Grade Portrait Lens (150mm equivalent), a high-speed, single-focal-length telephoto lens that is optimized for studio, stage, indoor sports and portrait photography” and it is priced accordingly at $899.
Though quite small and light by conventional 35mm standards, the M.Zuiko Digital ED 75mm f1.8 isn’t a particularly small or lightweight lens. The front element is large (58mm filter) and the barrel is constructed of metal rather then the more commonly seen plastic. It weighs 10.76oz (305g) and it measures 2.52" in diameter and 2.72" in length (6.40 × 6.91 cm). It looks and feels like a high quality lens from the days of mechanical cameras – except that there’s no aperture ring and the focusing ring has an exceptionally light and smooth feel. In part this is presumably due to the fact that the lens has an electronic focusing system, meaning that the focusing ring isn’t mechanically coupled to the lens focusing mechanism at all. Turning the focusing ring sends a signal to the focusing motors which then do all the mechanical work. It’s a “focus by wire” system.
The M.Zuiko Digital ED 75mm f1.8 has 10 lens elements in nine groups, including three ED (Extra-low Dispersion) elements to minimize aberrations. A 9 blade diaphragm is used to create an almost circular iris when the lens is stopped down. Since Olympus use a an in-body sensor shift stabilization system, the 75/1.8 has no internal optical stabilization. The “2x multiplier” of the four-thirds sensor gives the lens a similar angle of view to that obtained with a 150mm lens on a full frame camera.
The lens uses an MSC (Movie and Still Compatible) AF mechanism which provides fast and silent focusing via the movement of internal elements. There is no focusing distance scale and hence no DOF scale or infrared focusing mark.
Surprisingly for a relatively expensive premium lens, Olympus do not supply a lens hood with the M.Zuiko Digital ED 75mm f1.8, though one will be available (model LH-61F ). The cylindrical hood mounts externally and uses a friction thumbscrew to secure it on the lens. The price of the hood is $74.95 which seems a tad expensive, but then again I believe it’s made of metal rather than plastic (not that that makes it a better lens hood…). A premium hood for a premium lens (at a premium price).
Olympus M.Zuiko Digital ED 75mm f1.8 Specifications
Focal Length 75 mm Aperture Maximum: f/1.8; Minimum: f/22 Camera Mount Type Micro Four Thirds Angle of View 16° Minimum Focus Distance 33" (84 cm) Magnification 0.1x Groups/Elements 9/10 Diaphragm Blades 9 Filter Thread Front: 58 mm Dimensions (DxL) Approx. 2.52 × 2.72" (6.40 × 6.91 cm) Weight 10.76 oz (305 g)
The Olympus M.Zuiko Digital ED 75mm f1.8 feels like a high quality product. The manual focusing action is very smooth and requires a very light touch. It might even be slightly under—damped for some people. The lens feels substantial and is obviously built with precision. As mentioned earlier, the 75/1.8 uses an electrical “focus by wire” system.
Looking like a quality product and performing like a quality product aren’t linked of course, so just how good is this lens? The answer is very good indeed. There’s really very little to complain about in terms of performance.
Focus was fast, silent and accurate. There’s no AF/MF switch on this lens. Manual focus and full time manual focus override options can be selected from camera menus.
Distortion is essentially zero. Maybe there is some but I couldn’t see it and I looked quite closely. For all intents and purposes there is no distortion.
Vignetting, even wide open at f1.8 is barely detectable. Maybe 1/3 of a stop in the extreme corners. It would be very unlikely that vignetting would be an issue and if it was stopping down to f2.8 would totally eliminate any worries. The vignetting pattern was slightly de-centered as shown in the test image at the end of this review. Again not something I’d unduly fret about.
Similarly chromatic aberration is very well controlled. Even looking in the corners of the image at 100% magnification it’s very hard to see any trace of chromatic aberration.
So how sharp is it? Very sharp indeed. Probably sharper than the sensor of the camera I was testing it on (
Bokeh. Well, you could say that “Bokeh is in the eye of the beholder”. Bokeh is the quality of the out of focus blur and very much a subjective judgement. However the M.Zuiko Digital ED 75mm f1.8 seems to produce smoothly blurred out of focus regions. During testing I didn’t see anything objectionable with the lens either wide open or stopped down. Is it the best Bokeh I’ve ever seen? I don’t know since I’m not a Bokeh connoisseur but I’ve included some example images for you to judge for yourself by.
Why so good? Well, the Olympus designers did a good job – and the lens only has to cover an area 1/4 the size of a full 35mm frame which made their job a little easier. At $899 it’s not an inexpensive lens, so it was probably designed to a specification rather than designed to a price.
The Olympus M.Zuiko Digital ED 75mm f1.8 is pretty close to being as good as it could be (and as good as it needs to be) – and that’s not something I say very often. If it was any better you’d might need a better sensor than is found in any current M4/3 camera to take full advantage of any improvement.
So does it have any faults at all? There is perhaps a question of whether a 75mm lens on M4/3 is the best choice of focal length for a portrait lens. It corresponds to a 150mm lens on a full frame camera in terms of angle of view and though it’s an f1,8 lens and requires the exposure you’d expect for an f1.8 lens, it has approximately the same depth of field that a 150mm f3.6 lens would on full frame 35mm. So in terms of background blur (a desirable quality in a portrait lens), a 135mm f2 lens on full frame 35mm will give you more background blur than a 75mm f1.8 lens does on M4/3. Of course the M4/3 system will be much smaller and lighter than the full frame DSLR.
Another “nit-pick” is the minimum focusing distance of 33" gives a magnification of 0.1x which isn’t exactly “macro”, but then again it’s not designed to be, or market as, a macro lens.
I’m sure there might be some who could say the lens lacks “character” as a portrait lens, where “character” is defined by all sorts of aberrations that many fast lenses show when shot wide open. This lens doesn’t have any such aberrations and so produces a technically accurate and very sharp image. Since you can make a sharp image soft but you can’t make a soft image sharp, I wouldn’t call this an issue, though some might. Certainly as a fast low light lens for indoor sports and stage and theater work, sharpness is a virtue nobody is likely to complain about!
A final point is that the 75/1.8 has no special weather sealing. In a lens aimed at portrait and indoor shooters, this isn’t of much concern, but if might be if you wanted to use it outdoors with a weather sealed micro 4/3 camera like the Olympus OM-D E-M5.
For those who shoot with the micro 4/3 system and want a high quality, fast, prime lens, the
A lower cost alternative is the
Where to Buy
||Here are two rather boring crops from a shot of a railway timetable taken with the 75mm f1.8 at f1.8 using an Olympus Pen E-P3. The crop on the right is from close to the center of the image and the crop on the right is from the corner of the image. You can see the corner crop is very close in sharpness to that from the center, plus there’s no hint of chromatic aberration or distortion.|
||These 100% crops from shots shows the change in corner quality between f1.8 and f4. These were shot under controlled conditions using a resolution test chart with an E-P3 mounted on a tripod. As you can see there is a very subtle improvement at f4, but you’d have to look very closely at a real world shot to see it, if you’d see it at all. Note the absence of any chromatic aberration. Similar crops from the center of the image show no detectable difference. F1.8 appears just as good as f4 in the center|
||Here are crops from 4 images shot at f1.8, f2.8, f4 and f5.6 looking at the quality of an out of focus region (“Bokeh”). I’ll leave it up to the Bokeh experts to pass judgement, but I see no problems in this area. These are 30% crops from the original image|
||This is a shot taken at f2.8. It shows the lack of distortion as well as the center to edge sharpness, the absence of chromatic aberration and no visible vignetting.|
||This vignetting test at f1.8 is about the only shot which shows an optical imperfection. The upper image is as shot, the lower image is a contour plot. The different colors correspond to sets of pixels with identical values. As you can see the pattern is slightly de-centered. I repeated this test several times with the same general result and the image shown here is actually an average of 4 shots. I got the same results with an E-P3 and an E-PL1 body, so it’s not a camera related artifact|
||This shot was taken after sunset using the Olympus 75mm f1.8 lens set to f1.8. Shutter speed was 1/40s and ISO was set to 1600. The wide aperture of the lens, along with the in body stabilization of the E-P3, allowed the camera to be used handheld without pushing the ISO so high that noise became objectionable.|
||Here’s a comparison of typical “portrait” shots taken at f1.8 and f2.8. It’s evident that the larger f1.8 aperture produces a significantly smoother background than f2.8|