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Scott,
Very interesting.
I noticed the aberations are symetrical about the centre so I don't think it is because of tilt or looseness of the filters. The really are remarkeably like the aberations I get and I have a cut Baader filter in my camera (in addition to the sensor coverglass) so there are 2 optical windows between the imagiing surface and the lens.
I am half tempted to go back into the camera and completely remove the filter but am not sure if I would be able to reach infinity focus with the lenses I have (although most do focus a little past infinity).
The more modern lenses seem to be optimised to take into account the extra optical surfaces in a DSLR sensor.
Terry
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