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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Lens material: "glass" vs. "crystal"
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<blockquote data-quote="shinbone" data-source="post: 1580336" data-attributes="member: 15248"><p>When Swarovski marketing materials mentions a "crystal" decanter or a "crystal" wine goblet, the last thing they are thinking about is that item being made from a true single crystal.</p><p></p><p>It is true that Canon made/makes some high end camera lenses that utilize one or two fluorite elements in it to reduce chromatic dispersion. But, that is quite different from an entire lens assembly made up of single crystal elements. Plus, fluorite was the only crystal ever used as such, the oddball rare exceptions notwithstanding. Fluorite is relatively fragile, and so would be problematic in a rifle scope expected to withstand recoil and field abuse. And, fluorite elements are even less common, now, due to there being cheaper ways to achieve a similar reduction in chromatic aberrations, such as ultra low dispersion glass, which is an amorphous glass rather than a true single crystal component.</p><p></p><p>To the OP's question: "<em>is it not correct to say that you could </em></p><p><em>form two fundamental categories of products, those with glass lenses</em></p><p><em>and those with crystal lenses</em>"? IMHO, for rifle scope and binoculars, the answer is "no" because there are no scopes or binos made of true single crystal optical elements.</p><p></p><p>JMHO</p></blockquote><p></p>
[QUOTE="shinbone, post: 1580336, member: 15248"] When Swarovski marketing materials mentions a "crystal" decanter or a "crystal" wine goblet, the last thing they are thinking about is that item being made from a true single crystal. It is true that Canon made/makes some high end camera lenses that utilize one or two fluorite elements in it to reduce chromatic dispersion. But, that is quite different from an entire lens assembly made up of single crystal elements. Plus, fluorite was the only crystal ever used as such, the oddball rare exceptions notwithstanding. Fluorite is relatively fragile, and so would be problematic in a rifle scope expected to withstand recoil and field abuse. And, fluorite elements are even less common, now, due to there being cheaper ways to achieve a similar reduction in chromatic aberrations, such as ultra low dispersion glass, which is an amorphous glass rather than a true single crystal component. To the OP's question: "[I]is it not correct to say that you could form two fundamental categories of products, those with glass lenses and those with crystal lenses[/I]"? IMHO, for rifle scope and binoculars, the answer is "no" because there are no scopes or binos made of true single crystal optical elements. JMHO [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Lens material: "glass" vs. "crystal"
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