Camera terms: PDAF, OIS and different types of lenses & ToF camera

What is PDAF?


PDAF stands for Phase Detection Autofocus. PDAF is an autofocus technology that increases the focusing speed using planar image phase detection. This kind of technology is first used in interchangeable-lens digital cameras. This allows us to take High Definition photos of fast-moving objects. 

The Autofocusing speed of PDAF is much faster than contrast detection. Although, in early-stage PDAF is only used in high-range smartphones but nowadays it is also available in mid-range smartphones. 

What is OIS?


OIS stands for Optical Image Stabilization. Optical Image Stabilization helps to capture crystal clear photos while you're moving or handshaking.


Initially, OIS was used in DSLR and SLR but nowadays these features are often obtained in mid-range and high range.


What is a wide-angle lens?

wide-angle lens

The wide-angle lens has a wider field of view than our eye. In a wide-angle lens, the focal length is substantially smaller than the focal length of a normal lens. 


What is periscope in the camera?


Actually, periscope is used in ships and submarines to see the object above the sea level or to see objects which are not in the frame of sight. The same technology is used by smartphone manufacturers to create periscope in modern phones to increase the zooming range of smartphones.


Samsung introduced the 100X space zoom in their latest  Samsung galaxy Ultra S20 and Samsung galaxy Ultra S20 5G with the help of a periscope. 


What is an ultra-wide lens?

ultra-wide lens

The lens whose focal length is shorter than the short side of the film sensor.  With the help of an ultra-wide-angle lens, we can capture extremely wide pictures. It is mostly used for landscape photography because it fits much more than a normal lens.


What is a ToF camera?

ToF camera

ToF stands for ‘Time of Flight’. A ToF camera is used to create a depth map of the scene or object in the frame of view. ToF uses infrared light to determine the depth of information. The sensor emits light signals which hit the object in front of the camera and return back to the sensor just like the bat. 


The time taken by the signal to return back to the sensors gives depth-mapping capability. This technology helps to accurately measure distance. While compared to other 3d depth scanners, ToF is slightly cheap.

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