Reply to thread

Message: <blockquote data-quote="DW_" data-source="post: 50289" data-attributes="member: 8667">I agree with everything written so far. It's clearly it's a contrived "problem" and not something that will interfer with its performance but what I want to know is why some do and others don't. There's an article on the net that states the issue stems from rough handling and/or a lens that has been acclimated properly when moving between extremes and a weather seal has eroded. However, some of the lenses tested are brand new, which doesn’t seem to jive with this explanation. Again, if all 24-70’s showed this propensity that would be one thing but the fact that some do and some don’t is what makes me wonder.  </blockquote>