The distances all depends on the focal lenghts of your lenses and the distance to you screen (throw).
People usually put the bulb at the focal length of the first fresnel. (A little closer when using a condesor lens).
The distance between the lcd and the projection lens is calculated using 1/FL = 1/Dist + 1/Throw where FL is the focal length of the projection lens and Dist is the distance between projection lens and lcd.
The second fresnel should now be placed its focal length before the projection lens. (Be it before or after the lcd, but after the first fresnel).
If both fresnels are placed before the lcd you can have them glued together.
You would want a few cm between the lcd and the fresnels in order to not see the fresnel rings in the final image.
People usually put the bulb at the focal length of the first fresnel. (A little closer when using a condesor lens).
The distance between the lcd and the projection lens is calculated using 1/FL = 1/Dist + 1/Throw where FL is the focal length of the projection lens and Dist is the distance between projection lens and lcd.
The second fresnel should now be placed its focal length before the projection lens. (Be it before or after the lcd, but after the first fresnel).
If both fresnels are placed before the lcd you can have them glued together.
You would want a few cm between the lcd and the fresnels in order to not see the fresnel rings in the final image.
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