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Thread: Help figuring this one out!

  1. 12-30-2011, 12:00 PM #1
    cateye
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    Help figuring this one out!

    A guy needs a glass lens 75mm diameter lens + or - with a focal distance of 200mm to heat water with the sun! I am not sure of the application? What lens? I'm thinking a 75mm +4.50
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  2. 12-30-2011, 12:04 PM #2
    chip anderson
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    I think a lens of +5.00 would come closer to a 200mm focal length.
    "The trouble with America is Them! A. Bunker
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  3. 12-30-2011, 12:40 PM #3
    Wes
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    Quote Originally Posted by chip anderson View Post
    I think a lens of +5.00 would come closer to a 200mm focal length.
    +1
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  4. 12-30-2011, 01:44 PM #4
    cateye
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    Where do you get a plus 1
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  5. 12-30-2011, 02:22 PM #5
    optical24/7
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    Cat, Wes is agreeing with Chip. (As I do, a +5.00 has a focal length of 200mm.)
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  6. 12-31-2011, 06:54 AM #6
    braheem24
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  7. 12-31-2011, 11:39 AM #7
    Chris Ryser
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    Integrative Pressurized Solar Water Heater-HP........a little more expensive than a lens but more effective

    http://honger88.en.made-in-china.com...Heater-HP.html
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