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<blockquote data-quote="Bob Blaylock" data-source="post: 539974" data-attributes="member: 16749">I just now did that.&nbsp; I checked all the screws that were visible on the mount end of the lens.&nbsp; Most of them did seem a it looser than I thought they ought to be, so I tightened them up to what seemed right to me.&nbsp; I applied a bit of contact cleaner to a bit of tissue, and then rubbed it on the contacts of the lens.&nbsp; I mounted the lens, and rotated it back and forth several times in the mount.&nbsp; The tissue did come away looking a bit dirty, so perhaps the contacts on the lens were dirty.&nbsp; I'll have to see if next time, after the camera has been unused for a few hours, if the focus issue remains.&nbsp; One thing that might be a good omen—<a href="http://nikonites.com/off-topic/12528-post-your-latest-purchases-post538972.html#post538972" target="_blank">I bought a set of macro extension tubes several days ago</a>; and found that the focus motor action seemed to get weaker and more intermittent as I put more of these rings between the lens and the camera.&nbsp; Just now, I put all three rings on, and the focus motor action now seems as strong as with no rings.&nbsp; I'm figuring each set of contacts between each ring, between the lens, between the camera, is a place where some power to the motor can be lost to poor contact.&nbsp; I do note that the Auto/Manual focus and VR on/off stitches are located on a plate that has a screw holding it in place.&nbsp; What are the chances that there's anything behind that plate that is worth tinkering with?&nbsp; What are the chances of my simply ruining the lens of I mess with that?</blockquote>

[QUOTE="Bob Blaylock, post: 539974, member: 16749"] I just now did that. I checked all the screws that were visible on the mount end of the lens. Most of them did seem a it looser than I thought they ought to be, so I tightened them up to what seemed right to me. I applied a bit of contact cleaner to a bit of tissue, and then rubbed it on the contacts of the lens. I mounted the lens, and rotated it back and forth several times in the mount. The tissue did come away looking a bit dirty, so perhaps the contacts on the lens were dirty. I'll have to see if next time, after the camera has been unused for a few hours, if the focus issue remains. One thing that might be a good omen—[URL="http://nikonites.com/off-topic/12528-post-your-latest-purchases-post538972.html#post538972"]I bought a set of macro extension tubes several days ago[/URL]; and found that the focus motor action seemed to get weaker and more intermittent as I put more of these rings between the lens and the camera. Just now, I put all three rings on, and the focus motor action now seems as strong as with no rings. I'm figuring each set of contacts between each ring, between the lens, between the camera, is a place where some power to the motor can be lost to poor contact. I do note that the Auto/Manual focus and VR on/off stitches are located on a plate that has a screw holding it in place. What are the chances that there's anything behind that plate that is worth tinkering with? What are the chances of my simply ruining the lens of I mess with that? [/QUOTE]

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