Another thing to note: look at the marking position on an A7 or A9 for the focal plane vs the marking on the 5DIV. Yes, Sony has a much shorter flange distance, but their sensor is also set further forward by a good amount.
Sony seemingly has more going on behind the sensor than Canon does. If the sensor could be about as far back as it was in the Film days (ex: turn an AE-1 into a mirrorless camera), having the longer flange distance wouldn't change the overall body size very much.
For special wide-angle lenses where the shorter flange length could reduce lens size, have the sensor on a slide that moves it forward to the "short" flange position inside the body. If you can move lens elements back and forth with precision, you can move the sensor as well.
Sony seemingly has more going on behind the sensor than Canon does. If the sensor could be about as far back as it was in the Film days (ex: turn an AE-1 into a mirrorless camera), having the longer flange distance wouldn't change the overall body size very much.
For special wide-angle lenses where the shorter flange length could reduce lens size, have the sensor on a slide that moves it forward to the "short" flange position inside the body. If you can move lens elements back and forth with precision, you can move the sensor as well.
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