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<blockquote data-quote="Horoscope Fish" data-source="post: 305464" data-attributes="member: 13090"><p>Pretty sure the HD designation refers the hardened glass they use in the so-designated filters. According to Hoya, "<span style="font-family: 'Arial'"><span style="font-size: 10px">Hoya HD camera filters feature a hardened optical glass that has 4 times the breaking strength in ANSI standardized testing (ANSI Z80.3 : 2001) where steel balls of varying size and weight were dropped from a height of 50 inches onto the glass." </span></span></p><p></p><p><span style="color: #ffffff">...</span></p></blockquote><p></p>
[QUOTE="Horoscope Fish, post: 305464, member: 13090"] Pretty sure the HD designation refers the hardened glass they use in the so-designated filters. According to Hoya, "[FONT=Arial][SIZE=2]Hoya HD camera filters feature a hardened optical glass that has 4 times the breaking strength in ANSI standardized testing (ANSI Z80.3 : 2001) where steel balls of varying size and weight were dropped from a height of 50 inches onto the glass." [/SIZE][/FONT] [COLOR=#ffffff]...[/COLOR] [/QUOTE]
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