Results 1 to 2 of 2
  1. #1
    150+ Forum Groupie
    Join Date
    Nov 2008
    Location
    New Zealand
    Posts
    156
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Projector using fresnel lens ?

    Hi all
    came across this idea and even though its cheap does it work or is it just a clever con http://www.trademe.co.nz/Electronics...-404830878.htm

    Cheers
    Rhys

  2. #2
    300+ Forum Addict



    Join Date
    Feb 2007
    Location
    California, USA
    Posts
    406
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Projector using fresnel lens ?

    It produces a very dim image. The only light which can reach the projection screen must pass through the lens. Because a television or monitor is made to widely disperse light, most of the light leaving the TV/monitor screen surface will not pass through the lens. Worse yet, what light does make it through the lens is spread over a larger area than the TV/monitor screen and appears proportionately dimmer.