hello
i have a portable dvd player that im gonna try to make a projector out of it. i would like a folded design and need to know if a mirror from a rear projection tv will work? how do you tell if its fs or not?

will the s15 kit work for a small panel?

The mirror from an RPTV oughtt o be fine, if it's not FS then it wouldn't work well for the RPTV either.

The S15 optics will work with the smaller panel, but you might want to look into a precondenser.

The onlyn thing with portable DVD players is the resolution. Most are 480X234, which isn't going to look very good at more than about 60"

hello
thanks supra i know the panel wont be great.
i have a couple other questions if any one wants to take a poke?i was able to source out a over head projector from a school i will be using the lighting system from that and the lenses.now when determining focal length of a frensel lens or a triplet lens i hold it under a light and lift it until the light is in focus on the table then measure correct?

now lets say that is correct, i have a plummer lens that has a focal length of 240mm(that's if i'm right on how to measure focal length) and i also split the double lens 1 is 300mm and the other is 340mm. can i make this combo work for me? size of enclosure really don't matter i'm hoping to go folded anyways .

what are the pros and cons for split or non split lens set up?

In an OHP, most of the time the triplet will be marked with it's EFL. You can't really use an overhead light, since it's too close to get a real image, though if you measure the distances, you can still determine the EFL... It's just a lot easier to use the sun.

Split lens: Pro: Easy keystone correction. Con: Now there's a fresnel (Which isn't a particularly good lens) in the image path, which can cause some image degradation. (I've never found it to be a problem, though.)

Unsplit: Pro: best image quality. Con: Keystone correction difficult