Hey guys. I'm ordering parts for my first projector and have a big concern. I have been reading some old threads and the FAQ. In these I saw a number of people having the edges of their lcd being cut off(not projected) due to insufficient fresnel dimensions. Now, in the FAQ it claims the fresnels are cut to 9 3/4" x 11 13/16". This is smaller! than the width of my 15" lcd screen(12 wide). Thus I can see how the ends would get cut off.

I will be using my projector for a lot of games and windows use and thus do not want to lose any of my screen. Now, I noticed in the store it claims the fresnels to measure 9 15/16" x 12 9/16". Is this measurement accurate? Is it large enough such that the Entire lcd will be projected? I'm guessing the fresnel size changed since the FAQ and the posts I read with complaints were written. Am I correct to assume this?

Thanks for any help.

Yep, that's what mine are.



It depends on how your PJ is set up, but it's probably marginal as you don't want your image to get near the fresnel edges as refractions from the edge have been suspected to cause anomalies.

The further you move the field fresnel away from the LCD, the larger the image of the LCD appears. Try placing the LCD on a table, holding the field fres square above the LCD. Look at the LCD from about the fresnel's focal point. By moving the fres towards and away from the LCD you can see how much the LCD image 'fills up' the fresnel. Move it until you've got the image of the LCD near the edges of the fresnel and that's about your limit.

If you're not keystoning, this distance can be applied at the centre of the fresnel. If you are keystoning, this distance must be the maximum that the top or bottom edge of the field fresnel is away from the LCD.

For the collimating (rear) fresnel, I have found that about 35mm from the LCD is a good place to start.

A good rule of thumb is to make everything as adjustable as possible, then spend the time adjusting until you have the best picture.