| Jamez_Warner |
waiting on LCD but set up a 7" test transparncy along with my fresnel and a 500W halogen and an old lens I found
works fine but I cannot see the whole image ( it's cropped ), what is causing this - the fresnel or the projection lens?
James |
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| doughboy |
| Share a little more info. Split fresnel? Old lens type? Is it cropped on the sides or all the way around? spacing between lenses, light, and transparency. |
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| Jamez_Warner |
i've played around with various distances - I get the most on the screen with fresnel + image right up near bulb ( say 5cm !!!! )
its a single fresnel ( FL 300mm )
the old lens is flat on side and curved the other - was used in a spotlight... ( i know its not optical quality - i'm just trying to get an image first ! ;-) )
I ended up with fresnel + image bout 5cm from bulb and lens say 50cm away
James |
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| doughboy |
| I would say it is the old lens. It seems to be a condenser lens. |
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| Jamez_Warner |
how does that differ from a convex ? I have one with curves both sides...
James |
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