[JJ_SO]

Focus by wire is generally an unpleasant experience, a fine adjustment is basically complicated or impossible. It's a cheap way for the manufacturers and more often badly executed than well done. As if manufacturers think, our AF is so great, nobody uses MF anyway. 

 

Other lens: Sigma 10-20/3.5, has manual focus without wire.

Other idea: put a good torch into your photobag and light up the spots you want to focus