Aug 20, 2015

Fast auto-focus competition! Doogee F3 VS Huawei P8, Meizu MX4 & iphone 6

What makes a good camera? Most of us would only pay attention to the megapixels, but there are other criterias to evaluate a camera. Focus Speed, for example, is one of them. DOOGEE F3 packs a Samsung S5K3M2XXM3 sensor, which is also used by Samsung Galaxy S5, Vivo X5 pro, OPPO R7, Nubia My PRAGUE and Apple iphone6. The S5K3M2XXM3 contain a mechanism that supports Phase Detection Auto Focus(PDAF) allowing efficient  Auto Focus in the system.

What is PDAF?

Phase-detection auto-focus (PDAF) is an auto-focus method that provides high focusing speed. PDAF eliminates the need for measuring contrast within a sensor field, making it possible to adjust the lens to move its focal point quickly and directly to a new position to achieve optimal focus.  PDAF was first used in single-lens reflex (SLR) cameras and then applied in  CMOS Image Sensors for mobile devices such as smartphones. It's different from Contrast Detection AF. The camera keeps changing focus until the contrast from one pixel to the next is the highest. The camera doesn't know which way to focus so it is slow and not well-suited for action photography when the subject is moving all over the place. The 3M2 sensor boasts PDAF (Phase-Detection Auto-Focus) technology which enables the DOOGEE F3 to focus as fast as 0.1s. 

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