[silvio]

If the camera had a fisheye lens, it would distort the parts of the craft that are in its field of view, but those appear without fisheye distortion.

Unless I'm missing something else, the curvature you see is likely due to the spherical nature of planets.

[silvio]

They just switched cameras, and this one doesn't show parts of the craft, so my comment above won't make much sense, but the curvature I see with this camera is similar to the one I saw with the other camera which shows parts of the craft.