Adhesive on lens?

[james_taylor11]

Just received a 300mm F/4 L IS lens. I noticed that there is some substance

that looks like an adhesive (lock tight?) on the threads. This is on the

outside threads and I can see it inside the lens on the next set of threads down

in the glass. Anyone else seen this?

 

James<div></div>

[Marvin]

You might try some Goo Gone or Goof Off.

[franklin_polk]

If it doesn't come off on your finger, it is probably a substance similar to loc-tite. If I'm not mistaken, its there to prevent the retaining ring, the ring in the threads just in front of the element. (the one that holds in the front element(s)) from loosening and letting the elements get loose. Contrary to the previous poster, DO NOT use goo gone, especially that close to an element, If you are unhappy with it, simply return the lens.

[m_barbu1]

Goof Off will likely remove some of the finish as well. I would use that as a last resort (after scraping with a sharp object, which I wouldn't recommend either).

[bobatkins]

If it's not causing a problem, I'd leave it alone.

[yakim_peled1]

Is this a new lens? If so, I'd get it replaced.

 

Happy shooting,

Yakim.

[james_taylor11]

Thanks everyone ?

 

I?m going to send it back.

 

James