http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=60868&item=6371140258&rd=1

£4.50 should answer your question

ATB

Simon

I used to have one in the pub I used to run. They make the image a bit blurry, but OK if you are viewing 10' away after a few pints. The picture is totally invisible in all but the lowest of lights, adequate is the best I can say

i'm a tight git.....

How do they work ?

[Edited on 23/2/05 by Jon Ison]

right, never tried it but..

I predict you make a cardboard funnel to hide the tv screen in the wide end and then you put a lens at the narrow end. You'd need gaffer tape to stick it on and seal the gaps. You don't want light escaping except through the lens. It would project the TV picture onto a wall.

Bookshops sell those A4 sized flat plastic sheet lenses - might be good enough optical quality, I don't know. For a given lamp the brightness of the projected image depends on the size of the lens, sharpness depends on lens quality.

I made a projector like that once when I was a kid. Except it was a closed wooden box with a light in and a glass lens in a sliding tube. You put pictures on the back wall of the box and the reflected light shone through the lens and projected the picture onto the wall. I think the projection was upside down though, so you'd have to turn the TV upside down too I guess!

I bet that's the knowledge you pay for with the lens thrown in.

Nothing like this is as it appears...

I remember once seeing plans for free on the internet, didn't go through them in detail but as far as I can remember it's as Dave described. I always thought the brightness would be a problem, just try not to watch tv in the day

Pete

My brother in law (to be) was talking about dismantling an LCD monitor and combining it with an overhead projector. Not sure how well it would work to be honest, but worth a try maybe?

Chris