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       #Post#: 8330--------------------------------------------------
       New invisibility cloak device can hide almost anything
       By: SangueG Date: September 29, 2014, 10:37 am
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       New invisibility cloak device can hide almost anything
 (HTM) http://www.foxnews.com/tech/2014/09/29/new-invisibility-cloak-device-can-hide-almost-anything/
       *New cache ideas forming* But will wait till the cost comes down
       a bit  ;D
       #Post#: 8332--------------------------------------------------
       Re: New invisibility cloak device can hide almost anything
       By: Griff Grof Date: September 29, 2014, 2:48 pm
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       Wow, that's incredible!
       I can't see how it could be used with a cache though - maybe my
       creative cap isn't on  :D
       Now, imagine one which SHOWS things you can't see - that'd work
       for a cache too!  ;)
       Thanks for sharing!  :)
       #Post#: 8336--------------------------------------------------
       Re: New invisibility cloak device can hide almost anything
       By: walktall Date: September 29, 2014, 3:58 pm
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       The basic four lens version, you need a gap in the central spot
       for it to work or the item your hiding, doesn't cross the
       central spot
       [quote]To build your own Rochester Cloak, follow these simple
       steps:
 (HTM) http://www.rochester.edu/newscenter/wp-content/uploads/2014/09/lens-diagram-630x290.jpg
       For their demonstration cloak, the researchers used 50mm
       achromatic doublets with focal lengths f1 = 200mm and f2 = 75mm
       [list type=decimal]
       [li] Purchase 2 sets of 2 lenses with different focal lengths f1
       and f2 (4 lenses total, 2 with f1 focal length, and 2 with f2
       focal length)[/li]
       [li] Separate the first 2 lenses by the sum of their focal
       lengths (So f1 lens is the first lens, f2 is the 2nd lens, and
       they are separated by t1= f1+ f2).[/li]
       [li] Do the same in Step 2 for the other two lenses.[/li]
       [li] Separate the two sets by t2=2 f2 (f1+ f2) / (f1— f2) apart,
       so that the two f2 lenses are t2 apart.[/li]
       [/list]
       NOTES:
       [list]
       [li] Achromatic lenses provide best image quality.[/li]
       [li] Fresnel lenses can be used to reduce the total length
       (2t1+t2)[/li]
       [li] Smaller total length should reduce edge effects and
       increase the range of angles.[/li]
       [li] For an easier, but less ideal, cloak, you can try the 3
       lens cloak in the paper.[/li]
       [/list]
       A patent has been filed for this cloaking device.[/quote]
 (HTM) https://www.youtube.com/watch?v=oJb9RnAVDuE
       How it was done:
 (HTM) https://www.youtube.com/watch?annotation_id=annotation_775088&feature=iv&src_vid=oJb9RnAVDuE&v=GAmWs6zfTj8
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