scuba e
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I recently discovered that my 10.5 fisheye has a small scratch on the out most lens. Has anyone had experience with repairs or polishing of scratched lenses? Any ideas?
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There is a product named Polywatch you may want to look into. It was originally designed to restore watch crystals made of acrylic.
If the scratch isn't very deep it might help. However, if the lens is coated it would cause more damage than it would repair. Since this is the lens surface in contact with the water, the scratch is likely not going to be noticeable, unless you have strong side lighting sweeping across your lens.
Try some test shots underwater, then see how bad the scratch really is.