Mounting a fullframe mirrorless camera on a shift adapter opens up the possibility to do panorama stitching with an insane range of lenses - large format, 6x7, 645... normal, wide angle, telephoto...perhaps too many 
No doubt the best way to see the differences if time and money permits is to test and compare all of them, or to study and compare the specs of each lens. But to do this requires an at least elementary understanding of how different formats relate to each other, and how shift effects what you end up seeing in the image?
If I understand right a "normal" 50mm lens on a fullframe camera has similar field of view as a (more or less) "normal" 80mm lens on a 645 camera as a (more or less) "normal" 135mm lens on a 4x5 view camera. But when a larger format lens is mounted on a fullframe camera, the field of view is cropped due to the smaller size of the fullframe sensor - unless the lens or mirrorless camera is shifted to cover all of the field of view of the larger format lens and the resulting images is stitched together, right?
What I am having difficulty understanding is how to calculate what happens to the field of view visible in an image when a larger format, 67 or 645 lens is used for panorama stitching with a shift adapter. For example, how many mm of shift is required for a 135mm view camera lens mounted on a fullframe camera to show the same subject as a native fullframe 50mm lens??... how many mm of shift is required for a 135mm view camera lens mounted on a mirrorless camera to show the same subject as a wider-angle native fullframe 28mm lens?... etc etc...
The only conclusion I have been able to reach so far is: apples + oranges = fruit salad
No doubt the best way to see the differences if time and money permits is to test and compare all of them, or to study and compare the specs of each lens. But to do this requires an at least elementary understanding of how different formats relate to each other, and how shift effects what you end up seeing in the image?
If I understand right a "normal" 50mm lens on a fullframe camera has similar field of view as a (more or less) "normal" 80mm lens on a 645 camera as a (more or less) "normal" 135mm lens on a 4x5 view camera. But when a larger format lens is mounted on a fullframe camera, the field of view is cropped due to the smaller size of the fullframe sensor - unless the lens or mirrorless camera is shifted to cover all of the field of view of the larger format lens and the resulting images is stitched together, right?
What I am having difficulty understanding is how to calculate what happens to the field of view visible in an image when a larger format, 67 or 645 lens is used for panorama stitching with a shift adapter. For example, how many mm of shift is required for a 135mm view camera lens mounted on a fullframe camera to show the same subject as a native fullframe 50mm lens??... how many mm of shift is required for a 135mm view camera lens mounted on a mirrorless camera to show the same subject as a wider-angle native fullframe 28mm lens?... etc etc...
The only conclusion I have been able to reach so far is: apples + oranges = fruit salad
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