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I have read that Sinn uses a "hardened" AR coating on the crystal exterior of the U2. I am interested in hearing from owners about how hard this really is. Does it scratch easily like some other AR coatings?

Thanks,

Mike
 

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Never measured it, but I have had my U2 for a while and no scratches. It is hard enough for my use. :-!
 

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No scratches, used my U2 now hard for 3 years.
But the Ultimate U2 wearer is Tim, you might want to reat the Thread he started, it is a Sticky now.
 
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