Widening the frame
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The most popular choice for the third camera is a wide-angle lens. It widens the frame capturing more details in a single frame.
Wide angle lenses generally have a focal length that is shorter than the focal length on a normal lens.
It is popularly used to capture cityscapes, landscapes and architecture.
On Samsung phones, it can be found a toggle near the base of the screen where you can choose between a smaller frame — displayed as two trees — or a wider frame — displayed as three trees.
On some other phones, it’s a swipe to the left or right. The remainder normally have a toggle on top of the screen to widen the frame.
Though most companies use a depth sensor for the bokeh effect, it can also be brought out using wide angle lenses.
Zooming in — the right way
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There are two ways that smartphone zoom in to capture an image — using optical or digital zoom. Digital zoom is rarely effective and blurs the image even when the camera is stable.
Optical zoom, on the other hand, allows the user to capture a closer image without losing the details.
This is made possible using a telephoto lens. The addition of telephoto lenses also improves the quality of bokeh shots since the camera software has more accurate data to work from.
The monochrome sensor
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Some phones employ a monochrome sensor instead of the other two options. The sensor makes images more sharp since it captures black and white more effectively.
So when it’s used to capture a coloured image, the colour accuracy in the image is better and the edges of objects are better defined.
A monochrome sensor is still a relatively rare find on smartphones, though it’s most popular choice for the fourth sensor on quad camera phone.