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Message: <blockquote data-quote="WJC" data-source="post: 3285690" data-attributes="member: 25191">Positive documentation; great; follow it. Normally I would say someone should stop drinking the cheap stuff. But, I'm sure I know their motivation. The big boys discourage anyone from doing almost anything serious to their product (the 1,3,5,4,2) that might void the warranty.With being a Zeiss recommended repair shop for NON-WARRANTY repairs, I asked them about doing warranty repairs, since local repairs that would take less than an hour would have to fly across the country--twice--and sit on a shelf for days to be repaired. They said they couldn't do it. It would "open a can of worms" that might never be closed, allowing those who thought they knew about Zeiss binoculars to "tinker," void warranties, and cause Zeiss to have to go behind someone with a pooper scooper.Thus, the Leica advice should be followed. They know that the coatings are harder than the glass underneath. They know it's only 4 millionths of an inch thick, too. They also know wannabes have various interpretation of "light pressure," and that acetone (for example) can seep into places water won't. Their advice to a SOME professional optical techs may be foolish, but in a brochure going to a million homes it is sound.I still stand behind what I've said on the matter. If you don't think you could walk the tight rope over Niagara . . . you probably shouldn't try. Cheers,Bill</blockquote>