The curvature of the dome itself can cause CA-and the way the lens combination interacts with the dome can also cause it. This is independent of the DOF issues caused by aperture.
You can check the lens for CA on land, but not the dome, or the dome/lens combination. The port only produces a virtual image underwater.
I understand that but what am saying is that the teleconverter has issues on its own before you even put it in water
The image have green not blue or red fringing so I think the teleconverter is messed up and once it goes in water it is further aggravated
Closing down the aperture does fix dome issues because that aberrations is longitudinal but the lens has lateral aberrations of its own combined with the TC
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