Friday, October 1, 2010

Autofocusing with Non-Cross Type Sensors

Was reminded of a neat trick with the non-cross type sensors. These are usually the sensors on the periphery of the AF array. They work by detecting contrast in vertical line detail. The downside is that they are not as sensitive to detail that is predominantly horizontal.

So in low light situations, when you are using the edge AF sensors and the the camera is struggling to focus, a neat way to encourage focus lock is to turn the camera 90 degrees. If the camera acquires focus, continue half-pressing the shutter and return the camera to the orientation that you want, then full press.

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