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Thread: Projector using fresnel lens ?
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09-04-2011, 05:04 AM #1
- Join Date
- Nov 2008
- Location
- Usa
- Posts
- 162
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
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09-04-2011, 10:57 AM #2
- Join Date
- Feb 2007
- Location
- California, USA
- Posts
- 380
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.
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