Principal point values mismatch between ui and export

Development Asset Creation
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1

Hi,

when I export a registration as csv (internal/external camera parameters), the principal point data differs from the data shown in the application.

Example:
the application shows:
principal x: -0.463529
principal y: 0.392307

the csv shows:
principal x: -0.01287580742548625 (-1.287580742548625e-002)
principal y: 0.01089741910048868 (1.089741910048868e-002)

This post mentions dividing the application values by 35 would result in the exported values, but this doesn’t seem to be correct either.

Can somebody please explain how the values correlate?

Thanks.

2

Ok, I found this implementation where they use a value of 36 to convert between the values.

This works, but why 36?

3

Hi vector3
because of this: 35 mm equivalent focal length - Wikipedia
It should be 36, not 35 (maybe a mismatch).