Question about Sigma AF 28-200 Lens

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Lens elements upset

I had my older 28-200 3.8-5.6 AF-D lens in pieces to clean mould from the inner lens surfaces..unfortunately the tray holding the components ,all of which had been placed in sequence, was knocked upsetting the contents. What I would like would be a diagram showing the schematics of the optics. I can get close, but not close enough!

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I have the same lens. It got dropped into sea water. I rewashed in freshwater and took the lens apart after it dried, to clean the water spots. I was sent a diagram from Tamron but it is not high resolution file and is hard to make out the parts. I have posted it FYI:

http://tinyurl.com/bdkm2o

I am still searching for a better diagram. Do you have any leads? This one I've just posted came right from Tamron. I can't figure why they would fax something so illegible but it may help you? Does anyone have a high resolution diagram?

Thanks,
Peter

Posted on Feb 27, 2009

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The front elments is a sealed unit so I think it must be the back elements you need to no how the fit what size filter is un you lens is a hyperzoom .

Posted on Dec 13, 2008

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1 Answer

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If you still see dust and dirt which seems to be stuck on the surface, take a piece of the lens tissue from the kit and put several drops of the cleaning solution on it, enough to get it pretty damp. (Always apply cleaning solution to the tissue or cloth, never drop directly on the lens surface.) Cover the lens surface with the damp tissue, pressing it into the corners, but do not slide the tissue across the surface. Just lift it away. Repeat with another section of tissue.

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