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.