Hi ya,
Im a recent subscriber and have been reading the boards for about 2 months now, and want to try to start my PJ but have a question since there are some stuff I dont understand all the way. Any and all input would be appreciated.

I have a 8" LCD 800x600 screen and want to use it for the lcd.
I also want to keep this simple, hopefully the simpler the less room for mistakes.
The unsplit design looks the easiest, so im going to try that.
In the normal unsplit design the 15" LCD sits close to the fresnel lens but the 8" lcd i have is to small to sit that close. So is it possible to just position the LCD farther down the light path when its at the right size for the small lcd?

let me try to post a simple MSpaint example to demostrate..

Click to view attachment



will this work?
This simple design would allow me not to cut the fresnel, and it would get a large slice of the light coming from the lamp and should be a ok brightness.

Thank you in advance for any and all respone's.
Alex

Why is your LCD too small? Just frame it up in a piece of plywood or somthing. It might be easier just to cut your fresnels down to the size of your panel( just a little bigger). Its not too hard to do with a dremmel or a plastic/acrylic cutter. The plastic cutter is the cheapest route. 5 or 6 bucks at home depot.
But you really do want your fresnals close to the panel.
Have fun!

Are you:
A.) Trying to keep with the standard config because you are unsure how to modify?
B.) Tring to build a cheap projector 1st and upgrade to a 15" latter?

If the answer is A then just cut fresnels down to size, all the lengths are exactly the same, independant of LCD size, just make the box big enough to cover LCD.

If the answer is B then, yes this should work although I don't think anyone has done it before. It would have the advanatge of captureing all the light of a 15" which would capture 3.5 times as light as a standard 8" build (using option A) you might very well be onto some thing here!!! The box will also be almost 3.5 times larger but this maybe a better way to capture light for a small pannel rather than using a precondensor.

That is reason!
Even the admin Brian tried a standard bulb with a 8" Hami, but it didnt work out..
let me find link.. ok here,
http://www.lumenlab.com/forums/index.php?showtopic=5560

It wasnt bright enough, he said

So that was my thinking, try to capture the light a normal PJ would but focus it on a 8"
Seems kinda simple and I do realize this would basically as big as a normal PJ, no real advantage for using a smaller LCD, other than I have the LCD already so I wouldnt have to buy a 15"
But the question is would this work, It "Seems" like it would, I just dont have as firm of a grasp on how this all works. anyway .. .
Thanks in advance for all Help!!
Alex

try looking at some of the designs on allinbox.com to get a better idea