Tilt Shift Question

[Kaypee]

I use a tilt shots on Canons regularly and recently noticed my 24mm tse seemed a little soft on one side. I sent off to a reputable repair place in the UK and paid a couple of hundred quid to get it repaired. the changed some washers and realigned the lens but when i tested it there is still an issue with softness.

I'm testing the lens by using a tripod dialling in zero shift. I'm then simply rotating the lens around and expecting to see exactly the same image. The issue only shows when the lens has been rotated all the way round in one direction and its easy to avoid doing this.

Could this be a lens issue or is it effected by the rotating? I'm not sure whether its reasonable to expect the lens to rotate all the way around and still be as sharp as when its hasnt been rotated. the attached shots are 100% of the lens straight and maximum rotation. No shift.
Thanks
KP

[Gigi]

possibly a little tilt is happening, to throw it out of focus? What aperture are these shots?

[Bart_van_der_Wolf]

possibly a little tilt is happening, to throw it out of focus? What aperture are these shots?

Yes, that's the only obvious thing I can think of. Rotating an optically well centered lens should not change focus or resolution.

Cheers,
Bart

[Kaypee]

All shot at f11. Something is happening.

possibly a little tilt is happening, to throw it out of focus? What aperture are these shots?