How to remove dust under a camera lens?

If it is dust within the inner lens elements, there’s really nothing short of a full disassembly that could address the issue.

But the “feather” you describe may not be dust at all. Sounds more akin to mold. Setting the lens out in direct sunlight will often eradicate it within a few hours.

@RealEyesRealizeRealLies Hm interesting, I never knew mold could form in camera lenses. Thanks for your tip, I’ll try it out and see if it’ll work.

Yes, it’s often mistaken for dust or element separation.

Or you could go to a photo shop and ask there for some guidance.

@Hibernate We don’t have a photo shops that has knowledgable professionals to give such guidance here :P They’d just answer “I don’t know” or “We’re not sure what you should do” etc.