Canon PowerShot Pro90 IS Specifications
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This means that if it were a vidicon tube it would be 0.556 inches in diameter.
This measuring system is a leftover from the days of video TUBES and has nothing to do with the surface area of the chip in a direct sense. The Edmund Scientific Optics catalog has a sidebar that completely backs up the idea.
For instance, a "one inch" chip has a 16mm diagonal sensor array. A "one half inch" chip has an array of only 8mm in the diagonal. This means that the 1/1.8 = 0.555 inch measurement means NOTHING about the sensor array size. Unless they have changed the entire measurement system just for this chip, the actual sensor patch is 11% larger than the 8mm of a 1/2 chip or 8.88mm in diagonal.
(Mark Schubin of Videography Magazine)
Canon PowerShot Pro90 2.6 MP IS Camera Kit
w/ 10x Optical Zoom
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with 3.8x Wide Angle Optical Image Stabilized Zoom and 3-Inch LCD
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with 5x Wide-Angle Optical Image Stabilized Zoom (Black)
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with 12x Optical Image Stabilized Zoom
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with 3.8x Optical Zoom and f/2.0 Lens (Black)
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w/ 3x Optical Zoom
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