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Those small spray bottles of cleaner that you get when you pick up your new glasses dose a great job as well, also the little cleaning cloth that comes with it is excellent, not a smudge to be seen.
I agree with Peter there is so rubbish out there about cleaning optics and camera glass the coatings are much tougher than made out to be.
I clean my Canon 5D filter sensor filter with a good lens pen, have done so for years, never an issue.
Leon
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