Hi everyone

Reading through the forums gives way to much information about keystoning, however, one thing I dont understand is what effects this has on the triplets position??

Ok so if the fresnel in front of the LCD is mounted at an angle, then surely this vectors the light to a point below or above the triplet surely, therefore would it be necessary to adjust the vertical position of the triplet in order for the light to pass through?

Of couse I could be missing something.

any idvise would be much appreciated

The triplet’s vertical position won’t need to change. The light still focuses to roughly the same position.

DJ

Oh right, thanks for that Dazzla. I think that its just hard to vision until you have everything together.

thanks again

Sorry for the brief post, I was in a hurry.
Visualise this; with the fresnel parallel to the LCD the ray’s angle of incidence will be 0° (perpendicular). After it passes though the fresnel it will refract a certain amount and travel to a point in front. With the fresnel tilted back 5°the angle of incidence will now be 5° so the ray will be refracted more, just enough to go to the same point. A simular thing happens to the other side of the fresnel but instead of the ray refracting more it refracts less.
I hope that makes sense.

DJ

Thanks for the good explination Dazzzla. I had the same question in the back of my mind for a long time but was too stupid to ask.

Hey Dazzzla

Thanks for taking the time to produce the sketch, I was kind of hoping that would be the answer otherwise I would have to alter my design.

All the best