EXCERPT page containing first few paragraphs. 2019-03-24 15:19:01
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As discussed in Hasselblad X1D Sensor Size and Quality Expectations, the aspect ratio is a consideration in terms of what the actual usable megapixels are.
Why 4:3? A sensor with 4:3 aspect ratio reduces the size and weight of lenses, since the more squared-off the format, the smaller the image circle can be. The Leica S with its 3:2 aspect ratio is an oddball; larger formats these days are almost all likely to go with 4:3 sensors—easier for lenses and that is the ratio that Sony commonly manufactures for medium format sensors—a cost issue as well.
Photographers used to the 3:2 aspect ratio of a DSLR will note that cropping the X1D sensor to 3:2 still delivers 45.7 megapixels on a 44 X 29.2mm sensor area — not a big loss from the full height—and of course many images will work great at the native 4:3 aspect ratio.
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These systems are hugely expensive, so make the right choice for your own needs (full frame vs medium format).
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