Jon Ison
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| posted on 23/2/05 at 09:02 PM |
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Come on then, do these work ?
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=60868&item=6371140258&rd=1
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Simon
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| posted on 23/2/05 at 09:18 PM |
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£4.50 should answer your question
ATB
Simon
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Mark Allanson
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| posted on 23/2/05 at 09:22 PM |
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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
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Jon Ison
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| posted on 23/2/05 at 09:22 PM |
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i'm a tight git.....
How do they work ?
[Edited on 23/2/05 by Jon Ison]
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Dave Ashurst
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| posted on 23/2/05 at 09:33 PM |
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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.
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Hellfire
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| posted on 23/2/05 at 10:08 PM |
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Nothing like this is as it appears...
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scoobyis2cool
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| posted on 23/2/05 at 10:16 PM |
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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
It's not that I'm lazy, it's that I just don't care...
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ChrisW
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| posted on 23/2/05 at 11:49 PM |
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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
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