Compared with the comparatively recent Sigma 50mm f/1.4 Art lens that’s available in Nikon F-mount, this own-brand Nikon lens is only half the physical length and about a third of the weight. That’s mostly down to a much simpler optical design that’s based on eight rather than 13 elements. It’s therefore much easier to squeeze the Nikon lens into a spare corner of your gadget bag, and it’s less of a handful to shoot with. Indeed, the lens has a 58mm filter thread that’s no larger than that of its AF-S 50mm f/1.8G sibling. The main upsides of the f/1.4 lens are that it enables faster shutter speeds and a tighter depth of field.
Mount: Nikon F (FX)
Lens construction: 8 elements in 7 groups
Angle of view: 46 degrees
Diaphragm blades: 9
Minimum aperture: f/16
Minimum focusing distance: 0.45m
Maximum magnification ratio: 0.15x
Filter size: 58mm
Autofocus is quick and whisper-quiet, based on a conventional ring-type ultrasonic system. Typical upsides include mechanically-linked full-time manual override and a focus distance scale beneath a viewing panel. The inclusion of an in-lens autofocus motor also enables autofocus with the likes of Nikon D3xxx and D5xxx cameras, which lack in-body AF motors. The same goes for Z system mirrorless cameras, via an FTZ or FTZ II mount adapter.
The straightforward optical path doesn’t contain an aspherical element (as featured in the Nikon AF-S 50mm f/1.8G), there are no ED (Extra-low Dispersion) elements and no Nano Crystal Coat. Indeed, it’s a very traditional design but it does feature a well-rounded 9-blade aperture diaphragm, whereas the f/1.8 lens only has 7 blades. Super Integrated Coating is on hand to reduce ghosting and flare, and the lens is supplied complete with a bayonet-fit hood and carrying pouch.
Centre-sharpness is good at f/1.4, becoming excellent by the time you hit f/1.8. Corner-sharpness is less impressive when shooting wide-open, but still becomes highly impressive at f/2.8 and narrower apertures. The nine-blade diaphragm helps to maintain smooth bokeh when stopping down a little, with a very noticeable improvement over Nikon’s AF-S 50mm f/1.8G.
We run a range of lab tests under controlled conditions, using the Imatest Master testing suite. Photos of test charts are taken across the range of apertures and zooms (where available), then analyzed for sharpness, distortion and chromatic aberrations.
We use Imatest SFR (spatial frequency response) charts and analysis software to plot lens resolution at the center of the image frame, corners and mid-point distances, across the range of aperture settings and, with zoom lenses, at four different focal lengths. The tests also measure distortion and color fringing (chromatic aberration).
Center-sharpness is pretty good wide-open and becomes excellent from f/1.8 right through to f/16. Corner-sharpness is highly impressive in the range of f/2.8 to f/16, but relatively mediocre at f/1.4.
Lateral chromatic aberration is minimal but longitudinal or axial chromatic aberration, often referred to as ‘bokeh fringing’ can be a little noticeable.
Many 50mm standard prime lenses are pretty much distortion-free, but this one does produce a little barrel distortion that can be noticeable when uncorrected.
Some recent lenses go all out for performance and quality, giving any notion of compactness the cold shoulder. This Nikon lens harks back to 2008, when 12-megapixel image sensors put less stringent demands on the resolving power of lenses. Even so, it delivers very pleasing image quality from a refreshingly small and easily manageable build, weighing in at just 280g. Not just for full-frame cameras, it also works a treat as a portrait prime on Nikon’s DX (APS-C) bodies, with an effective focal length of 75mm.
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