What is laser AF?
Laser focusing is there to help out with a deficiency in the normal kind of focusing used by mobile phone cameras, and most cameras of all kinds – contrast detection. This focus system uses the normal output from the camera sensor, analysing it as the focusing engine moves back and forward in order to find out at which points the image is sharpest.
The issue? If there’s not much light, there won’t be enough contrast in the image to judge whether it is in focus or not.
The laser focusing aid provides this light. The output from a low-power laser is scattered out across the scene, giving multiple points of light upon which the contrast detection system can hang. Focusing on a little point of light on a subject is just as good as focusing on the subject itself.
Using this kind of focusing rules-out having to use the LED flash as a focus aid, which is particularly handy if you want to take pictures of people in poor lighting. The less time spent with lights flashing in your eyes, the better.