Oh Deer! :eek!: ...... judging by the poor bambi in the picture at the bottom of the link, with the bins weirdly sitting atop their "kill" , maybe HD stands for "Highly Dead" ....... :-C
Thanks GG, hahaha, I must have seen that Vortex stuff hundreds of times - okay - back on the planet now o
It's a bit of a 'shotgun' :gn: :-O approach to marketing, they've got everything in there - High Density, High Definition, Vivid High Definition Colours, ...... no HT glass though ------ only HunTers ....... :cat:
Here's some examples of HD usage within the script over at Vortex Nation ......
High Density, could also refer to flint glass containing various rare earth elements which would make sense to use at the eyepiece end, though the reference to 'extra low dispersion glass' indicates more objective end. It's hard to judge superiority unless you know the exact optical design and can measure the weight of the optical train within the context of the form factor achieved and the parameters (Fov, ER, CA, field characteristics, overall size, weight) and performance of the instrument as a whole. It's the whole optical train design and how the individual components match that counts though along with the materials and properties and specifications. At the end, really it's the view that counts :t:
You'd have to go through all the optical glass catalogues, but a quick look at this ready reckoner shows that Hoya equivalents to FPL-53 (what henry calls the 'gold standard' in ED glass) is actually of lower specific gravity than more garden varieties of ED glass such as FPL-51 equivalents .....
http://www.hoya-opticalworld.com/english/products/crossreference.html
So you might interpret the marketing as saying "look guys we're using the heavier glass which we know isn't the best ED glass available, but we're gonna chuck enough buzzwords around to obfuscate the issue - oh and don't dig too deeply into those either, since what we're really saying is that at best you're going to get broadcast standard HD or ~2Mp resolution which is well below the equivalent capability of your eye, but heck look at all the dead animals! - these things really work!" ..... LOL, and Bob's you're Uncle! :-O (no not you Ceasar - just one of my favourite sayings since I actually do have an Uncle called Bob!
o
It will be interesting to see what approach Nikon takes ...... I think they will rightly trumpet the wide flat field and low weight. I hope to heck they nail the CA (regardless of what glass they use), go light on the fluff and let the binoculars do the talking for themselves.
Chosun :gh: