Often, we hear much talk about the advantages and disadvantages of phase detection vs contrast-based autofocus systems. But not everybody knows what that means or why it matters. I had a rough idea, but I didn’t really understand it myself until I watched this video from photographer David Flores for B&H. In it, David explains how each of the two systems work, when it’s best to use one or the other, and how various camera AF systems work today using one or a combination of both methods.
Video Showing How Light Travels In a Digital Camera
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Even with digital images existing for over 40 years, the process of light becoming an image inside a box still somewhat magical. This movie takes the Nokia Lumia 1020 and breaks down how light transverses the lens, shutter, hitting the sensor, goes into the imaging processor and finally arriving at the LCD. Some of the early stages if entry also show the different lens elements and the images stabilization mechanism.
While the process of smartphone-photography is not 100% similar to the process on a DSLR, it gives a pretty good idea on the light path while keeping it magical.
[Behind the lens of a 41MP Nokia Lumia 1020 via popphoto]
P.S. If you are a Lumia fan, you can see 50 of them in action here.
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