How optical zoom works on a smartphone – Gary explains

Read more: https://goo.gl/qDtq2Y
Dual camera smartphones boasting “optical zoom” capabilities are appearing more often now. Here’s a breakdown of how the technology works.

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20 thoughts on “How optical zoom works on a smartphone – Gary explains

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  2. 1:42 Since the convergence angle changes when the focal length changes, a more accurate magnification ratio might be MR = (f1/f2)*(f2-dObj)/(f1-dObj) as derived from the Thin Lens Equation, instead of just f1/f2. Equivalently, MR = (f2/f1)*(f1-dImg)/(f2-dImg).

  3. Quad camera setup needs to happen

    1. black n white depth information sensor
    2. the usual rgb sensor with 24mm focal length
    3. 135 degree wide angle lens
    4. 50mm zoom lens

  4. While what you have said Gary is mostly true there are a few phones that do not actually fall into exactly what you have said. The Nikon Coolpix S800c for example while technically more a point and shoot camera than phone but it was running full Android and so I believe could have made VOIP/Skype etc calls at least if you used a Bluetooth headset. I also thought there was a Sony phone but I can't see to find it. I think I remember reading on AA a month or 2 ago that one of the unreleased models is going to offer true optical zoom by making a sort of periscope.
    I could see in future that it may also be possible to use the High Res shot mode type technology used in some of the top Olympus cameras to offer more resolution in an image which then could be cropped with less noise etc. I guess in a way they are doing this to an extent now by combining the images from 2 cameras but doing sensor shifting I am sure to give a better result at least when there is nothing moving in the scene.

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