Zoom is a feature that people often use in smartphone cameras, but pictures get blurred and grainy. Smartphones being so slim, getting optical zoom higher than 2X was almost impossible. Well, at least it was so until now!
It has been possible to achieve optical zoom higher than 2X
by a technology which is known as ‘Periscope Camera.’ Let us see how this
camera works to provide higher zooming without compromising the image quality.
The basic structure of a periscope camera consists of a mirror
in a prism, a lens, and an image sensor. The light is allowed into
the prism, which bends the morning to 90 degrees. This light then passes through
the lens to provide the necessary zoom and is then sensed by the image sensor to
send signals to the smartphone. This arrangement allows the image sensor and
the lenses to sit inside the phone instead of popping out, which would look very
awkward. Also, the periscope camera sensor is perpendicular to the phone's back instead of parallel to it like other camera sensors.
Recently Huawei has launched a smartphone (Huawei P30 Pro)
equipped with a periscope camera that allows up to 5X optical zoom. Another
smartphone that comes with this technology is the Oppo Reno which provides 10X
optical zoom. Xiaomi is also working on a periscope lens smartphone camera, and it
is expected to be delivered in upcoming smartphones. Below are some images which depict the zoom achieved by the periscope camera.
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