google glass wrong field of view

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I'm trying to obtain the horizontal field of view of google glass camera. The getHorizontalViewAngle() function of Camera.Parameters return the value 54.8°, But by manual measurement I got the value of about 74°. (The way I measure is by placing the camera in a center of circle with degrees marks, where the right side of the image shows 0°. The left size of the image shows 74°.) Any ideas?

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