SOURCE: Vivitar Camera Lens Users Manual
Vivitar was acquired by Sakar in August 2008.
=> http://www.sakar.com/press.aspx
Try their support pages (I didn't check to see if they had manuals. The website was running very slow)
=> http://www.sakar.com/search.aspx?type=sc
SOURCE: Water inside the lens (Canon EF-S 17-85mm F4.5-f5.6 lens)
if it is only fogged you can blow hot air on the lens while fully zoomed in and after the water has evaporated, zoom out to compress the moist air out. do this several times.
SOURCE: How to dismantle the lens front element. My reason
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 ... ::--))
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