<p>Mine rattles, too. Appears to be slop in the zooming mechanism. I think it's normal for this lens. I have not had any problems with the image quality of my copy, so I don't think it's anything to be concerned with.</p>
<p>This may be of some help:</p>
<p><a href="http://users.skynet.be/morris/praktica/index.htm">http://users.skynet.be/morris/praktica/index.htm</a></p>