It's in the viewfinder and showing up on the negs too? Usually you would get one or the other but not both. Dust on the lens itself rarely shows up as a discernable image. Only exception I can think of is if the camera uses a pellicle (half silvered fixed mirror) instead of a solid mirror. I don't think the x700 has that. I have had problems with Minoltas getting dust into the pentaprism, actually watched a bug walking around inside my viewfinder once, but this doesn't affect the image on the film. If it bothers you much, take it in for a CLA. It certainly won't hurt it.