A full frame sensor has a 1.0x crop factor, and the industry standard for focal lengths is in the full frame/35mm standard because of this. You’ll note that the chart in the opening section also shows the various crop factors associated with the size of the relative sensors. While the image circle is smaller than the Hasselblad 53.4 x 40mm sensor, it is still considerably bigger than any full frame image circle, and the lens mount diameter reflects that. This means that medium format lenses are going to be bigger than comparative Sony full frame lenses as a matter of course, because they start at nearly a 66% larger diameter. The front opening of lenses changes according to the focal length and aperture combination, but the rear diameter at the mount is consistent. The Sony full frame -Emount is 46.1mm in diameter by comparison, closer to the APS-C size than the massive medium format dimensions. The Fuji X-mount (APS-C) is 44mm is diameter the GF mount is a whopping 76.5mm in diameter. If you are unfamiliar with medium format and know Fuji more for X-mount, prepare to be shocked by how huge the mount size actually is.
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