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  1. #1

    Join Date
    Jan 2006
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    905

    Interesting source for large, fine pitch fresnels

    Walking the dogs the other day, I noticed a newish Zenith 51" projection TV being scrapped behind the local repair shop. As I walked I noticed that the screen appeared to have a fresnel lens incorporated. After our walk, I went back and 5 mins. later, had an interesting 45"x25" sandwich of rigid acrylic sheet, a lenticular array and an extremely large, extremely fine pitch fresnel. A few minutes of peeling the tape away and the three readily separated.

    It appears to have a f.l. of about 24" or so, and readily burns grass and anything else in the way. (solar furnace anybody???) As soon as I'm done redesigning my 20x24, I'll be trying it out.

    So, make friends with you local TV repairman, he actually may have some interesting toys to play with. (not to mention using the rear projection lenses as incredibly fast, as in ~F1.0 or so, imaging lenses, once you remove the secondary corner correction element on the front).

  2. #2

    Join Date
    Jan 2005
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    528
    Hmmm, something else for which to keep an eye out at the dump. Thanks!

    Charley

  3. #3

    Join Date
    Nov 2003
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    5,243
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    9
    everyone is scrapping over head projectors. Those fresnels are funky.
    Technological society has succeeded in multiplying the opportunities for pleasure, but it has great difficulty in generating joy. Pope Paul VI

    So, I think the "greats" were true to their visions, once their visions no longer sucked. Ralph Barker 12/2004



 

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