I found a similar question about the 18-200. Someone suggested screwing the front element tighter. Is it possible to do the same with the 18-300? My problem happens at 200-300mm. I am not sure how to lift the outer ring around the lens and access the tabs (if they exist) to tighten it. I saw youtubes about cleaning the 18-200 but nothing for 18-300.

I also have an additional problem with the MANUAL option: at 300mm it is impossible to focus. Thank you all in advance for your suggestions and assessments.

  • 1
    Please clarify: in manual focus at 300mm, you cannot turn the focus ring at all? Is it grinding, or does it feel stuck, or... ? When you are zooming from ~200mm to 300mm, is there any clicking, stickiness, grinding, anything other than completely smooth movement?
    – scottbb
    Aug 7 '17 at 0:56
  • Are you the only owner of this lens (did you buy it new, or used)? Has it been dropped, damaged, bumped, etc?
    – scottbb
    Aug 7 '17 at 0:56
  • 1
    When you are trying to autofocus at the longer focal lengths, does it happen always? If not, what is different between those situations? Are you trying to autofocus while in poor lighting? Any details help.
    – scottbb
    Aug 7 '17 at 0:59
  • Just a sanity check: you're not using it with a teleconverter, right?
    – meklarian
    Aug 7 '17 at 6:01
  • Thank you all for your questions and requests for details: Aug 8 '17 at 2:19

additional thought - at longer extension, this lens' aperture gets smaller to the point that some bodies cannot activate the autofocus. if you aim at a well defined dark//light vertical line (say a wall corner in sunlight), does the lens focus well? if so, the issue is not the lens.

  • This is not correct. All Nikon DSLR bodies can autofocus at ƒ/5.6, which is the widest aperture of this lens at 300mm.
    – scottbb
    Sep 7 '18 at 17:41

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