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use a blower on the eyepiece to get rid of anything that could scratch the coatings,breathe on it and gently wipe with a microfiber cloth,sorted.
i would never touch my ep's with a lens pen,the 2 times i have had to clean my most valuable ep that's how i have done it with absolutely no problems ,just do it when you really have to ,that's my 2 cents worth
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