I'm just wondering if someone on here knows the power of the fresnels in OHPs. I know that the fresnels are doubled but I would like to know the typical power of each lens so I can buy my own larger (size) lenses. Most fresnel lenses I have seen are 2x (not page magnifiers) and I am wondering if 2 of these 2X lenses doubled up will mimic the fresnels of a overhead. If anyone here can help me with this I would greatly appreciate it.
Common mistake here!
ok the fresnel in OHP projectors (the one at the bottom) is purely to disperse the light of the lamp.
It does not have good projection or magnification properties.
BUT the lens at the TOP of the projector, is very useful
Liam
www.DIYprojectionTV.tk
ok the fresnel in OHP projectors (the one at the bottom) is purely to disperse the light of the lamp.
It does not have good projection or magnification properties.
BUT the lens at the TOP of the projector, is very useful
Liam
www.DIYprojectionTV.tk
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