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The following chart presents a comparison between basic parameters of the tested lens and other ultra-wide angle zooms designed for mirrorless cameras with APS-C sensors.

As you can notice, the Sony 10-20 mm is physically the lightest and almost the smallest. Only the Canon 11-22 mm can compete with it in this area; its zoom ratio also amounts to 2 but it is easier to manufacture for three reasons: first, it is slower, second, its angle of view is narrower, third, it is designed for a tad smaller detector.

In the photo below the Sony PZ E 10-20 mm f/4 G is positioned between its predecessor, the E 10-18 mm f/4 OSS model, and the ultra-wide angle fixed-focal Sony E 11 mm f/1.8.

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The tested lens starts with a metal mount that surrounds a contact plate and a rear element, 23 mm in diameter, that doesn't move. The element is positioned behind a black, 22×16 mm frame with rounded corners and the area around it is black, matt, without any slits or visible electronic parts. Overall, from this side everything looks very well.

The proper body of the lens is made of plastics. It starts with an immobile ring on which you can find the mount type (E-mount), a white dot, making an alignment with a camera easier, the lens's serial number along with information that it was produced in China.

On the enlarged part of that immobile ring you find an inscription with the name and parameters of the lens, its G series mark, the producer's logotype, an aperture lock button (which can be alloted also other functions from the camera's menu level), a focusing mechanism mode switch (AF/MF) and a W/T switch that allows you a smooth change of focal length.

Then you find a ribbed zoom ring, 9 mm wide. The ring is a focus-by-wire mechanism without any focal marks. If you want to know the focal length value you have to look at the screen or in the viewfinder.

Next is a manual focus ring, also coverey by ribs. It is 7 mm wide and also a focus-by-wire construction. It moves with a very weak resistance but still within the margin of comfort. Its focus throw amounts to an angle of about 150 degrees. Taking the parameters of the lens into account, it is a significant value, allowing you very precise settings.

The lens ends with an immobile part of the barrel which turns into a hood mount for a petal-type hood.

The front element is convex, immobile, 28 mm in diameter. It is surrounded by an inscription with basic parameters of the lens, and a non-rotating filter thread, 62 mm in diameter.

The lens doesn't change its dimensions either during zooming or focusing – such a feature guarantees that it remains weather-sealed and doesn't suck dust in the construction. What's more, even though the movement of elements happens inside the barrel, the barrel itself is hardly big, quite the opposite, the lens seems to be very compact and handy for its parameters.

When it comes to optical construction you deal here with 11 elements positioned in 8 groups. Among them you can find three aspherical elements, two made of low dispersion ED glass, and one which is aspherical and made of ED glass at the same time. Inside, there is also a round aperture with seven blades that can be closed down to a value of f/22 at the maximum.

Buyers get in the box with the lens: both caps, and a hood.