The following chart presents a comparison between basic parameters of the tested lens and other full frame 28 mm f/1.8-2.0 lenses. Only the Leica is smaller than the Sony as it belongs to the group of the smallest and physically the lightest models. It also sticks out of this group with its smallest filter diameter and the highest number of aperture blades.
In the photo below the Sony FE 28 mm f/2 is positioned between the Sigma A 35 mm f/1.4 DG HSM and the Canon EF 35 mm f/2 IS USM.
The tested lens starts with a metal mount which surrounds contacts and a rectangular 32x24 mm frame. Inside that frame there is a small case with a rear element, 26 mm in diameter. From the side of the mount the lens seems to be properly blackened.
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The proper body of the lens is made of black metal; it starts with an immobile, smooth ring with a white dot, making an alignment with a camera easier. Then you see the producer's logo along with lens and mount markings, its serial number and information that the instrument was produced in Thailand. The ring also features an inscription 'FE 2/28' but you can't find any focusing mechanism mode switch.
The next part is a manual focus ring, completely covered by fine ribbing, as wide as 24 mm. It is a focus-by-wire construction, without any distance or depth-of-field scale. Running through the whole range needs a turn through an angle from 60 to 70 degrees if you move the ring quickly and even 270 degrees if you turn it slowly.
Further on you see a narrow, metal ring which turns into a hood mount. The front element doesn't move and is just 28 mm in diameter. It is surrounded by an inscription with the name and parameters of the lens, along with a non-rotating filter thread, 49 mm in diameter.
When it comes to optical construction you deal here with 9 elements positioned in 8 groups. The producers boast of two low dispersion ED glass and three aspherical elements (one of them being called Advanced). Inside, you also find a round aperture with nine diaphragm blades which can be closed down to a value of f/22 at the maximum.
