Why not a 21.6mm x 21.6mm sensor?

Started Jan 23, 2013 | Discussions thread
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Great Bustard
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Why not a 21.6mm x 21.6mm sensor?
Jan 23, 2013

The entire image circle for mFT lenses could fit within such a sensor.  While such a sensor would be 25% larger than an APS-C sensor (468 mm² vs 372 mm²), it would still be barely more than half the size of a FF sensor, so I don't imagine the cost of the sensor itself would be an issue.

The advantages of such a sensor, however, are substantial:  you would not need to rotate the camera from landscape to portrait orientation (especially convenient if using on-camera bounced flash) and you could crop to any aspect ratio you like with no IQ penalty.

So, what are the downsides that negate the upsides?

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