Are Sensor Pixels Square?

Started Oct 9, 2012 | Discussions thread
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Stephen Barrett
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Are Sensor Pixels Square?
Oct 9, 2012

Judging by the number of pixels in an SX30 or SX40 photo, the width-to-height ratio is exactly 4:3.
The sensor dimensions from the specs, however, are 6.17 mm x 4.55 mm.
(6.17 / 4.55 ) x (3 / 4) = 1.017
Does this mean that the sensor's horizontal pixel pitch  is 1.7% larger than the vertical?  Or does it mean that some of the picture width is cropped off by the camera so that the actual image width is only about 6.07 mm?
I have been calculating image widths by:
(Width of image on computer screen) / (total frame width on computer screen) x 6.17 mm.
I think this is OK if the vertical and horizontal pixel-pitches are equal but, if the camera is cropping, maybe I should be using a width of 6.07 mm.

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