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Thread: reduce beam

  1. #1
    Join Date
    Apr 2012
    Location
    Spain
    Posts
    133

    Default reduce beam

    Hi.
    How to reduce the beam of 638nm and 445nm, for approximately 3mm. To coincide with Green.?




    Best regards.
    Juanma.

  2. #2
    Join Date
    Nov 2008
    Location
    Cleveland Ohio
    Posts
    2,599

    Default

    Expand green to match larger beams using telescope.

  3. #3
    Join Date
    Apr 2012
    Location
    Spain
    Posts
    133

    Default

    Hi.

    With cylindrical lenses?


    Thank you.

  4. #4
    Join Date
    Apr 2012
    Location
    Spain
    Posts
    133

    Default

    Sorry.
    Where I can buy a telescope to expand the beam 5mm, for Nichia NDG 700mw/520nM with G2 lens?

    Thank you.

  5. #5
    Join Date
    Nov 2008
    Location
    Cleveland Ohio
    Posts
    2,599

    Default

    make your self. Buy two plano convex lens such that the ratio of the focus length of each lens is the ration of the magnification you want. For example a 2x could be a 100mm and a 50mm lens a 3x could be 100mm and a 33mm etc.... The distance between the lens is the sum of the lens fl. for example the 2x would be 150mm long. You can do 10mm and 5mm and get the same result for a 2x (thanks planters

    There was a place I use to buy them for like 20.00 but I can't remember the name of the place.

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