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#1
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HDL-3CT Sunglasses
http://www.hdl-3c.com/customer/mainm...?section=pilot
quote: The patented HDL-3CT lens technology was designed specifically for the Aviation Industry. :unquote Yet, a search of google archives does not come up with a single instance of this technology being discussed in any aviation newsgroup. When I asked my optometrist's dispenser, they claimed never to have heard of it. Anybody using this technology? Any comments? |
#2
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The was supposed to be HDL-3C.
I pasted from the site, and it had the "TM" (trademark symbol) after the 3C. Sorry. "Icebound" wrote in message ... http://www.hdl-3c.com/customer/mainm...?section=pilot quote: The patented HDL-3CT lens technology was designed specifically for the Aviation Industry. :unquote Yet, a search of google archives does not come up with a single instance of this technology being discussed in any aviation newsgroup. When I asked my optometrist's dispenser, they claimed never to have heard of it. Anybody using this technology? Any comments? |
#3
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Icebound wrote: http://www.hdl-3c.com/customer/mainm...?section=pilot Anybody using this technology? Any comments? My nose says it's just a good bit of marketing spin. I tend to buy good sunglasses and I like them, but to be quite honest I can't tell much of a visual difference between my $100 Ray-Bans, my $300 Maui Jims, and my $15 gas station backups, and I have pretty sharp 20/20 vision. The Maui Jims are great for fishing because the polarization is really good but for the same reason I can't wear them while flying floats, for which I have the Ray-Bans. Some people swear by the various Oakley colored lenses but I've never really gone down that road as I've already invested enough in shades for one decade. -cwk. |
#4
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#5
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"Icebound" wrote in
: http://www.hdl-3c.com/customer/mainm...?section=pilot quote: The patented HDL-3CT lens technology was designed specifically for the Aviation Industry. :unquote Yet, a search of google archives does not come up with a single instance of this technology being discussed in any aviation newsgroup. When I asked my optometrist's dispenser, they claimed never to have heard of it. Anybody using this technology? Any comments? I'm not an expert, but I know a little about optics being a laser junkie. Anyway, I read the webpage and after weeding throught the marketing catch phrases here's my two inflation devalued cents: These are just optical quality neutral density lenses. By optical quality I mean that they've taken care to get the shape of the lenses right as opposed to just any old shape. If a lens is not ground to the right shape it will distort the image. Remember Hubbles early woes? Most glasses are ground with a simple spherical surface whereas the ideal shape is often a parabola or asphere. Spherical lenses are easy to grind, parabolas difficult, and aspheres downright nasty (usually molded). An asphere is a lens whose surface follows a complex curve. Neutral density means it filters all visible wavelengths equally. Most sunglasses, even grey ones, tend to have a tint. They may cut the blues more than reds making reds stand out more. My cheapo $3 swap meet sunglasses do that. In the advertised glasses it sounds like they've tried to reach that ideal neutral color where there is no tinting caused by the glasses. Also, these glasses are nice and dark. By reducing the amount of light entering the eye in a full daylight view, the dynamic range is increased. That is, bright objects don't wash out from being too bright. One analogy would be music that's cranked so loud it's hard to hear it clearly. In a nutshell they're new technology probably isn't anything new. What's special is these lenses may just simply be designed right and manufactured to tighter specs. I see on their products pages that they come in various colors, which is contrary to the neutral density rule. Ideally one doesn't want color as, of course, it colors what you see. Ultimately though everyone's eyes and preferences are different and the only reliable test is for the individual to try them. One person may think they're a godsend while another may find them unbearable. Brian -- http://www.skywise711.com - Lasers, Seismology, Astronomy, Skepticism Seismic FAQ: http://www.skywise711.com/SeismicFAQ/SeismicFAQ.html Blog: http://www.skywise711.com/Blog Sed quis custodiet ipsos Custodes? |
#6
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john smith wrote:
Raybans are no longer the product they once were. When Luxotica bought the brand, they reduced the warranty to uselessness. When Bosch&Lomb owned the brand, the warranty was lifetime, and they honored it. Obviously YMMV, but my impression with a pair I bought about 2 years ago in Solvang on the way back from Catalina was that the lenses are as good as ever and the frame is even better. Having said that, one piece of glass sometimes pops out, but they have been dropped, pulled, twisted etc (I love my girls...) and still going (relatively) strong. I've always bought Rayban. For a 'computer geek' since the age of about 15 and after countless hours in front of TVs, crappy monitors, but lately only DVI LCDs, I finally went in for my first ever full eye exam. Turns out I almost have 20/10 vision - woohoo! Perhaps the lens do help, perhaps not, but I'm sticking with Rayban. Hilton |
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