317 mm fresnel lens help - Click HERE for Original Thread
makaveli956
i am a newbie i am trying to make my own projection tv i just ordered the 317mm focal length Fresnel Lens and dimensions are : 12 9/16" (319mm) x 9 15/16" (252.4mm) x 2mm Groove Pitch: 0.5mm was wondering is 1 enough to get the job done or do i need 2
zzonbi
It's enough, but you can use more as well. Usually 2 are used. Now make sure you get a projection lens with a longer focal, let's say twice 317mm.
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