But Canon photos usually have width:height = 3:2.

According the code in Lensfun, the half of height is normalized to be 1. 
So the domain of image is:
x: -1.5 -- +1.5
y: -1 -- +1

If we want to remain in the -1 -- +1, we will ignore the outer portion of the 
image ?
Is this what you mean ?

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