if it is under warranty then by all means, send it in with sample photos to show the problem -- you don't say precisely what you mean by ghosting, but double images of any sort shouldn't be showing up and can mean a bad misallignment of the lenses or lens separation -- a lens problem of that magnitude will cost more to repair than it would cost to just replace the camera.

which, if i were you, i would ask the seller to do. The Vb is a lovely camera, although if you like it you could also look at a Va, which is the same thing except it lacks the removable hood and costs less.