The following chart presents a comparison between the tested lens and other 50 mm full frame devices as fast, aperture-wise, as f/1.7-1.8. As we noticed in the introduction chapter most of them are simple constructions consisting of 6 elements positioned in 5 groups. In most of cases the minimum focus of the lenses amounts to 45 cm, with an exception of the new Canon.
In the photo below the Sony FE 50 mm f/1.8 is positioned next to the A mount Sony 50 mm f/1.4 and the Nikkor AF 50 mm f/1.8D.
The tested lens starts with a metal mount surrounding a contact plate and a rectangular frame. That frame begins a quite long, dark, and well-matted tube inside which a rear element is positioned about 2 cm deep. The element is 23 mm in diameter and it moves with the whole optical system when you set the focus. The tube surrounding it features slits and gaps – you can spot some electronic parts through them.
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The proper body of the lens is made of black plastics. It starts with a smooth ring which doesn’t move. On that ring you see a white dot, making an alignment with a camera easier, the producer mark, the lens and mount mark, the serial number and information that it was produced in China.
The diameter of the ring increases as you get away from the mount and on that widened fragment you see an inscription ‘FE 1.8/50’. A manual focus ring, as wide as 22 mm, is another part of the lens. It’s a ‘focus-by-wire’ construction, without any distance or depth of field scale.
Further on there is a narrow, metal ring which turns into a hood mount. The front element is 27 mm in diameter and round it you see an inscription with the name and the parameters of the lens. Then comes a non-rotating filter thread, 49 mm in diameter. The front element extends along with the whole optical system during focusing.
When it comes to optical construction you deal here with 6 elements positioned in 5 groups. One of these is aspherical. Inside you can also find an aperture with seven blades which can be closed down up to f/22.
As the diagram above shows, you deal here with a classic Double Gauss construction. The system of elements: one group (1+1+1) plus the second one (2+1) are very much like the older reflex camera devices, e.g. the Minolta AF 50 mm f/1.7, the Canon EF 50 mm f/1.8 II or the Nikkor AF 50 mm f/1.8 D. One aspherical element is the only serious difference here.
Inside there’s also an aperture with seven blades which can be closed down to f/22 at the maximum.
