This is the direct link (in Chinese) to a Nikon Asia Q&A entry. Rough translation:
Question:
Why does the internals of the lens look so rough? Will the bubble-like stuffs affect the PQ? Will they shed off and accumulated in the lens?
Answer:
The bubbles were the remains during the production of the lens. They are magnified through the lens so look obvious. It will not affect PQ and will not accumulate.
fyi: pictures of my 70-200 VRII lens with a perfect “thread”: picture 1 | picture 2.
