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Old 2nd January 2004, 01:27 AM   #31
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Join Date: Oct 2003
Location: USofA
instead of using a big mirror, could u use a big peice of plexiglass covered in mylar to transfer the image from the projector to the screen?
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Old 2nd January 2004, 04:11 AM   #32
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Location: The Carolinas
Yeah I thought about it but it would be easier to buy a plexi-glass mirror.
You can buy them form www.usplastics.com you might want to check this site too they sell everything literally they sell everything, ballast for MID bulbs and the bulbs check them out www.mcmasters.com
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Old 6th January 2004, 05:27 PM   #33
dbc105 is offline dbc105  United States
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I use to own a rear project tv but some part went bad and it was going to be $600 for parts. I guess my buddy that looked at it still has it in his shop. has anyone used a bad big screen tv and just put a lcd setup in it? the screen and lense are aready there. any thoughts on this would be a help. I am going to try to call him this weekend and see if he still has it.
David
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Old 6th January 2004, 10:04 PM   #34
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Location: The Carolinas
I guess it can work. What size is the screen? If going to use a computer LCD you would need to use a lense with a low focal length to get the projected image to fit the screen.
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Old 7th January 2004, 11:29 AM   #35
dbc105 is offline dbc105  United States
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the screen is 50" to 55". will I have to use a wide screen LCD and if it has a lense inside do you think I could use it? if not how do I figure focal length? I am going to give him a call today to see what he has sitting in his way. if I can make it work it sure would save a lot of work.
David
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Old 7th January 2004, 11:39 PM   #36
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Location: Norway
Default rmccoll

I know this is a bit off-topic, but I have a Fujinon 4 1/2 lense collecting dust. Just wanted to know if you consider the 4 inch Psone lcd (assuming that is the one you use) decent for projecting purposes (not rear projecting)? Would be nice to build a cheap projector to project a 50-60" image considering the psone screens are so inexpensive.

Seems to me you get a decent picture disregarding the dark sides. Would it be possible to project an image on to a normal screen (not rear projecting) and up a picture of it here?
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Old 8th January 2004, 12:15 AM   #37
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Join Date: Dec 2002
Location: columbus ohio
I have a used fresnel from a old big screen. I played around with it a while back using my ohp setup. I suppose the reason rptv manufacturers use a large fresnel instead of a standard grey translucent screen like what is normally used for lcd rear projection is the hot spot problem. Bright in the middle dark on the sides. I have a high quality projection tv, but I can say that I would prefer to use a standard grey screen, with the fresnel you have viewing angle problems and it seems muddier than rear projected lcd images I have seen.. anyone have ideas on how to use a grey screen instead of a big *** fresnel?
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Old 8th January 2004, 04:30 PM   #38
dbc105 is offline dbc105  United States
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well I got in touch with my buddy and he has several rear projection tv's he is going to throw out. in selecting a case what do I need to look for? type of lenses, fresnels, screens, etc? any and all help is greatly appreciated.
David
dbc105
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Old 9th January 2004, 08:25 PM   #39
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Join Date: Jun 2002
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i have an old 48" fresnel collecting dust around here. its a little scratched, but i guess it works. it just sits and collects dust.
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Old 9th January 2004, 11:52 PM   #40
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Sorry I have not post but I just entered college and just got my internet connection on. The Psone lcd will work I used the sony brand 5 inch lcd for my first one.
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