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Dual Cameras vs. Single Camera

Dual-camera smartphone systems are truly useful for three things:
  1. Portrait photo (bokeh/blur).
  2. Telephoto (zoom)
  3. Wide-angle photo
http://www.u4get.com/wp-content/uploads/2016/09/1474480905_400_Hands-on-with-the-iPhone-7-Plus%E2%80%99-crazy-new-Portrait-mode-640x360.jpg

Dual Lens and Higher-Quality Photography (Sensor Fusion)

 
  1. Dual-lens system have too often two lower-quality (surface area, pixel size) sensors and lenses
  2. It is difficult to align the data from both sensors. This could lower sharpness
  3. Image tuning varies greatly from OEM to OEM

 best camera phone in 2018



A dual camera phone is packed with two cameras on the rear. Out of these two, one is a primary camera and the other acts as a secondary camera. This camera-combo strives to make a picture more dynamic and intense by adding minute details, which a single camera fails to add.


but not all dual camera is better than single camera phone.
best camera phone in 2018


Google Pixel 2 XL is best camera phone in 2018
Promising phone with new caveats

A bigger, sharper screen and thinner bezels make the Pixel 2 XL the more desirable Google phone, but some early units have been dogged by screen issues.


flagship phones may be turning to dual cameras for striking photo effects, but Google’s latest Pixel relies on computational smarts to aid its single 12-megapixel rear camera. Despite the lone lens, the Pixel 2 XL can still create Portrait Mode style pictures similar to the iPhone 8 Plus and Galaxy Note 8 with a stylish background blur. (So can the smaller Pixel 2 for that matter.) And because it’s computational photography powering the effect, the Pixel 2 XL’s front camera can take Portrait Mode shots, too. Throw in Google Lens — a feature that lets adds object recognition to your camera — and you’ve got one clever camera phone in the Pixel 2 XL.

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