Digital BW, The Print

Thats the thing. The image from the camera (when viewing on the 
computer) is fine. No signs of these lines at all. 
> If the only thing that changes is the image capture device, then the
> image capture device is the source of the problem.  You may have a
> defective CCD on the digital camera.  Lines in a digital image are
> defects in the CCD; perfectly straight lines in a scanned film image
> that are consistent from image to image and from film to film are
> usually defects in the scanner (again, in the CCD of the scanner).
> Non-perfect lines in a single roll of scanned film are usually 
scratches
> on the film, and most lines on film come from lab carelessness 
during
> development.  If lines appear on many films from the same camera 
but not
> on films from other cameras, there may be something in the camera 
that
> is scratching the emulsion.
> 
> There are some other remote possibilities, like unusual 
interpolation
> artifacts in the printer (a possibility if you are getting the same
> lines from two different digicams, especially if they both have the 
same
> pixel dimensions).  Another possibility is a defect in the printer 
that
> is masked by the grain of most film scans but is easier to see 
against
> the normally grainless backgrounds of digicam photos.  It would 
have to
> be extraordinarily subtle to show only on prints from digicam shots,
> though.