I strongly recommend you do not try this unless you are trained in camera/lens repairs and have the correct tools and solutions. Too many things that can go wrong, not the least of which is introducing more dust into the lens than you manage to clean off. Also, most lenses have a lesser or greater amount of sealant which may potentially be ruined. Lens elements are carefully aligned, and any misalignment on re-assembly will negatively affect focus in any lens, more so in a zoom. If the dust is affecting your photos, I suggest you have a local Sigma authorized camera repair shop clean it. And, most will have a limited warranty of 30 or 90 days. I speak from experience ... ::--))
Answers & Comments
I strongly recommend you do not try this unless you are trained in camera/lens repairs and have the correct tools and solutions. Too many things that can go wrong, not the least of which is introducing more dust into the lens than you manage to clean off. Also, most lenses have a lesser or greater amount of sealant which may potentially be ruined. Lens elements are carefully aligned, and any misalignment on re-assembly will negatively affect focus in any lens, more so in a zoom. If the dust is affecting your photos, I suggest you have a local Sigma authorized camera repair shop clean it. And, most will have a limited warranty of 30 or 90 days. I speak from experience ... ::--))