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Folks;
Lensing results in path, and hence image, distortion of the background object. There is no single focussing point. There is a line along which light is bent towards, but this only indicates the centre of mass of the 'lens'. There is no 'convergence' and thus, no 'divergence'.
As such, 'divergence' of the light paths, if the 'lens' is composed of anti-matter would be pure conjecture, which I'm happy to challenge.
Photons from the background source, can act as matter or anti-matter.
Photons have no mass, (whether they appear as matter or anti-matter), so lensing is not caused because of attraction between masses. It is caused by distortion of spacetime around massive objects, and as light follows geodesic paths, it follows the curvature of this spacetime.
If there was a 'blob' of antimatter, it would probably be enormous in size and any field it may create, would be widely dispersed and there would be insufficient anti-matter density to result in some kind of observable 'anti-lens' effect (such as the conjectured 'divergence').
Also, who knows whether anti-matter possess some other property when it interacts with spacetime (or not) ? (Answer: know-one knows).
Cheers
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