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Forum: Pentax News and Rumors 02-05-2015, 12:17 AM  
Pentax Full-Frame, DFA* 70-200mm, DFA 150-450mm Announced
Posted By davidsladek
Replies: 544
Views: 87,974
Aero Bright is for the internal lens surfaces (AFAIK it is the best of the three Pentax coating smc / HD / AB, but the most expensive and prone to scratch), HD is for external and SP is another layer on the external lens to repel dust and moisture

Somebody, please, correct me, if I am wrong
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