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This alters the refractive index between glass and air

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Sony SLT-A77 - The Expanded Guide by David Taylor canon 1200D battery Grip This alters the refractive indexThe Sony A77 is a new interchangeable lens camera that uses Translucent Mirror Technology to offer high speed shooting: the mirror splits the optical pathway between the main image sensor and a separate phase detection autofocus sensor, allowing a simplified design that enables the camera to be physically smaller.