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The tests also measure distortion and color fringing (chromatic aberration).On June 28, 2009, the world-famous physicist Stephen Hawking threw a party at the University of Cambridge, complete with balloons, hors d'oeuvres and iced champagne.

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We use Imatest SFR (spatial frequency response) charts and analysis software to plot lens resolution at the centre of the image frame, corners and mid-point distances, across the range of aperture settings and, with zoom lenses, at four different focal lengths. Photos of test charts are taken across the range of apertures and zoom settings (where available), then analyzed for sharpness, distortion and chromatic aberration. We run a range of lab tests under controlled conditions, using the Imatest Master testing suite. This lens does show some barrel distortion when uncorrected, but you would have to be using software that does not apply correction profiles вЂ“ some will use these but not necessarily apply them automatically. Even wide open, edge sharpness is pretty good.ДЇujifilm cameras donвЂ™t just apply digital lens corrections to in-camera JPEGs, they embed them in the raw files too, so that most raw conversion software will load these embedded correction profiles automatically, so that if there is any distortion it will be cancelled out. The lab tests reveal some fall-off, but not enough to be obvious in real world shots. What a great little lens! Unless youвЂ™re shooting wide open at f/2.8, you can expect corner-to-corner sharpness.

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(1/150sec f/16, ISO 320 вЂ“ Dynamic Range Priority mode.) (Image credit: Rod Lawton/Digital Camera World) Wide open at f/2.8, the Fujinon XF27mmF2.8 R WR gives a decent background defocus effect with nearby subjects, but if you switch to the minimum aperture of f/16, as we did here, you get impressive near-to-far depth of field. ItвЂ™s not a problem for stills, but we probably wouldnвЂ™t use this lens for continuous video AF. The original Fujinon XF27mm F2.8 was pretty choppy and noisy by modern standards, and while this one is quick enough on the X-E4, it doesnвЂ™t seem so very different Fujifilm says the AF is fast, precise and near-silent, but it didnвЂ™t seem quite that way to us.

Our only complaint would be the autofocus motor. It does the job, though, without spoiling the slim profile of the lens and even offers some of the protection of a lenscap. This lens comes with a curious little вЂinvertedвЂ™ lens hood which actually angles inwards not outwards. ThereвЂ™s no focus distance scale and hence no depth of field markings, but these can be displayed on the camera instead. The focus ring is fairly narrow, but still pretty generous given the very short barrel, and itвЂ™s easy to find with your fingertips without having to look. If you set the aperture ring to the вЂAвЂ™ position, the aperture will be controlled automatically the the camera body in program AE or shutter priority mode.

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The aperture ring is nice and positive, with clear 1/3EV detents between the full aperture markings. This lens feels very well made, so its 84g weight is a bit of a surprise. (Image credit: Rod Lawton/Digital Camera World)

The Fujifilm X-E4 likewise does not have in-body stabilization, but there are other Fujifilm cameras that do, including the Fujifilm X-S10, X-T4 and the older X-H1. ThereвЂ™s also no optical stabilization вЂ“ only Fujifilm zoom lenses have stabilization, and even then only some of them. At 84g itвЂ™s also way lighter than most prime lenses. There will be lots of times when this lensвЂ™s small size proves much more useful than a faster optic.

The f/2.8 maximum aperture is pretty modest, given that most primes these days are f/2, f/1.4 or even faster, but thatвЂ™s the price of compactness. Its slim profile means itвЂ™s much easier to slide your camera into a coat pocket, too, without the need for a camera bag. This makes it slightly less вЂwideвЂ™ than a 35mm equivalent lens вЂ“ the classic semi-wide lens focal length for street photography вЂ“ but still wider than a 50mm вЂstandardвЂ™ lens.Д¤1mm is a pretty effective all round focal length, and if you were to choose just one prime вЂwalk aroundвЂ™ lens to keep on your camera, it might just be this one. FujifilmвЂ™s X-mount cameras use the APS-C format, so although this is a 27mm lens, its angle of view is actually equivalent to a 41mm lens on a full frame camera.

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