heya Low, try to get a hold of a 250w hqi bulb, they are double ended and small, also the cdm-t arent impossible to get, but are tricky to find in the states, those would be your best bet and its what most of us are using, the others are just far too big.
You can go the loa route, uvodee is the man for that, so im sure he can help you with that setup. On those ps lcd screens they dont need a great deal of light to get them going, they are fairly transmisive.
Trev
You can go the loa route, uvodee is the man for that, so im sure he can help you with that setup. On those ps lcd screens they dont need a great deal of light to get them going, they are fairly transmisive.
Trev
Member
Joined 2004
10-4 ace.....thanx for the heads up......
the hqi and cdm-t are both metal halide bulbs.....correct?
are there other ways to go other than MH bulbs?
the hqi and cdm-t are both metal halide bulbs.....correct?
are there other ways to go other than MH bulbs?
Member
Joined 2004
well, my power supply for my screen finally came today.......
hopefully this will get the ball rolling faster for me.....i'm going to start the stripping process for the ex-pc case and begin setting up the parts to get a beginning idea of how things will go......
i'll take some pics of any interesting stuff along the way........
hopefully this will get the ball rolling faster for me.....i'm going to start the stripping process for the ex-pc case and begin setting up the parts to get a beginning idea of how things will go......
i'll take some pics of any interesting stuff along the way........
Im trying to put my sony lcd on top of my overhead. So i got it all apart but i dont understand how you get the ribbon back into the slot without bending it too much? does it go back in upside down?
Member
Joined 2004
i'm not sure with that one, i'm not going for the flat setup.....
you might be able to get a 90 degree angle if you move the screen to the other side of the controler board.....i don't know how you would get it totally flat
you might be able to get a 90 degree angle if you move the screen to the other side of the controler board.....i don't know how you would get it totally flat
Member
Joined 2004
i myself haven't tried removing the cable from the screen or the board and hopefully won't need to.........
i can get almost a 90 degree pivot from it without doing so, if i need to get more i'll do it if i have to
i can get almost a 90 degree pivot from it without doing so, if i need to get more i'll do it if i have to
Hey lowjacker those LCD you bought off ebay do all of them work?
I want to buy one if it works. The one I bought off ebay was never sent to me.
I want to buy one if it works. The one I bought off ebay was never sent to me.
Member
Joined 2004
they all worked......
i've sold them already........sorry
look on ebay for a guy named....to_the_highest_bidder
he's selling psx screens...gamecube screens....and ps2 screens in 3 and 5 packs....that's where i got mine......it said that none of them worked......but all i did was add a proper power supply and they all fired right up.......
i've sold them already........sorry
look on ebay for a guy named....to_the_highest_bidder
he's selling psx screens...gamecube screens....and ps2 screens in 3 and 5 packs....that's where i got mine......it said that none of them worked......but all i did was add a proper power supply and they all fired right up.......
Member
Joined 2004
ok, i searched some to find some answers and got over 200 results each time i searched and since this is my thread i'm going to ask these questions....
1. how does one determine (figure) the focal length of a fresnel lens?
2. what exactly does that knowledge do for you?.....in other words.....what exactly is the focal length?......is it the distance the item must be from the lcd?......i know it's not the distance from the projected image....seeing as how their all in mm.......
3. how do you cut a fresnel down to 5 inches......or is it better to cut some cardboard or wood and just attach the fresnel over the hole as centered as possible?
if i have 2 fresnel lenses...one is 220mm fl and the other is 320mm fl....would i put the first one 220mm from the light engine and then place the second 320mm from the light engine and then mount the lcd in the center of the 2? and if i had a 240mm projection lens.....is the 240mm from the lcd to the nodal point or from the second fresnel since it's the last thing before the projection lens?
1. how does one determine (figure) the focal length of a fresnel lens?
2. what exactly does that knowledge do for you?.....in other words.....what exactly is the focal length?......is it the distance the item must be from the lcd?......i know it's not the distance from the projected image....seeing as how their all in mm.......
3. how do you cut a fresnel down to 5 inches......or is it better to cut some cardboard or wood and just attach the fresnel over the hole as centered as possible?
if i have 2 fresnel lenses...one is 220mm fl and the other is 320mm fl....would i put the first one 220mm from the light engine and then place the second 320mm from the light engine and then mount the lcd in the center of the 2? and if i had a 240mm projection lens.....is the 240mm from the lcd to the nodal point or from the second fresnel since it's the last thing before the projection lens?
Member
Joined 2004
or, do these have nothing to do with the actual setup and you just figure out the needed spacing by trial and error?
i'm not using a condensor so it will go from the light engine to the first fresnel then the lcd then either the second fresnel or right to the projection lens......if the first fresnel takes the light rays from the engine and parallels them to enter the lcd at a 90 degree angle then after passing through the lcd will they have to be re-converged so to speak?....or will the projection lens gather the image and project it for me?
i'm not using a condensor so it will go from the light engine to the first fresnel then the lcd then either the second fresnel or right to the projection lens......if the first fresnel takes the light rays from the engine and parallels them to enter the lcd at a 90 degree angle then after passing through the lcd will they have to be re-converged so to speak?....or will the projection lens gather the image and project it for me?
Member
Joined 2004
in the pic below
how far would it be between the fresnels and the lcd.....and how far to the light from the first fresnel......and the second fresnel and the projection lens.......
is it always one set distance or is it a measured distance or is it trial and error?
if it's measured.....how do you get the measurement?.....is it the focal length of the lens?.......if so, from the 2nd fresnel to the projection lens....which fl do you use?...the fresnels or the projections....or is the projection lens' fl strictly for it's ability to project?
how far would it be between the fresnels and the lcd.....and how far to the light from the first fresnel......and the second fresnel and the projection lens.......
is it always one set distance or is it a measured distance or is it trial and error?
if it's measured.....how do you get the measurement?.....is it the focal length of the lens?.......if so, from the 2nd fresnel to the projection lens....which fl do you use?...the fresnels or the projections....or is the projection lens' fl strictly for it's ability to project?
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Wow you ask some questions or what? lol
For a small lcd dont split the frensels, you will only get rings and you will have to make your box bigger as it will all have to be spaced out further apart to not see the rings, trust me, on a 5inch lcd u dont need to split the fensels for an even image. A condenser will also give you a massive gain in light output.
Ill start with the light engine, ok from your lamp to your first frensel, say its 210mm, thats where the lights arc should be placed away from that frensel, but you can get away by making it smaller and brighter being a 5inch lcd. You dont need to light up your whole big large frensel as you will only be using 5inches of the center of it, so its possible to move it closer without getting the dim corners, the way to find this focal is to turn a light on, get the 2 frensels and focus the rooms ligh bulb onto the table, measure and that should give u a hella bright and even image.
Ill also note, frensels in singular fashion have their specified focal, when put together, that focal changes and becomes smaller.
There are 2 ways of doing this, 1 is to measure the top frensels focal up from from the top frensel and place a desk lamp, focus that on a table and you should get a combined focal, that will also be shorter then the rear focal but longer then using the rooms light method. The rooms light method was the second lol.
Ok your confused, try the room light method first, measure the distance from the rear frensel to the table, take that and record it, now place your light at that distance.
So say the measurement comes to 118mm, (thats close btw) ok so light is in its box, the rear frensel is 118mm from the lamps arc, both frensels are together.
Now place the lcd on the otherside of the front frensel, place it 10mm infront of the front frensel so we dont get any rings. Also on a side not dont cut your frensel the same size of the lcd as it will be too small, cut it abit bigger, say 5mm.
Ok so now we have the light, the rear frensel at 118mm from the lights arc, the top frensel ontop of the rear frensel together, then we have 10mm to the lcd, so now we are upto the projection lens.
The projection lens will never be at its focal length, this is because of focusing the image on the wall, the bigger the image the shorter the lens will be away from the lcd, the smaller the image the further it will be from the lcd. The best thing to do with any projection lens is to give it a quick test at distances close to its focal, this way we can determine what size of image we can get with what distance. Say you want a 80inch image, well then get your 80inch image focused but have the lens mounted only in the front panel half way, so we will have some leeway to not only focus your intended size, but also if u wanted to go smaller or bigger you can.
The focal on a projection lens u just use a guide, thats it, u cant say that you will get a 100inch image at its designated focal, cos u cant, and u wont, so thats trial and error. Try to also get a top frensel to match your lens as this will ensure the whold image will fit through the lens and will give you a slightly brighter image.
The copy lens works fine on a 320mm so no probs.
I hope it helped abit, prety hard to cover all of your questions in one go lol.
Trev
For a small lcd dont split the frensels, you will only get rings and you will have to make your box bigger as it will all have to be spaced out further apart to not see the rings, trust me, on a 5inch lcd u dont need to split the fensels for an even image. A condenser will also give you a massive gain in light output.
Ill start with the light engine, ok from your lamp to your first frensel, say its 210mm, thats where the lights arc should be placed away from that frensel, but you can get away by making it smaller and brighter being a 5inch lcd. You dont need to light up your whole big large frensel as you will only be using 5inches of the center of it, so its possible to move it closer without getting the dim corners, the way to find this focal is to turn a light on, get the 2 frensels and focus the rooms ligh bulb onto the table, measure and that should give u a hella bright and even image.
Ill also note, frensels in singular fashion have their specified focal, when put together, that focal changes and becomes smaller.
There are 2 ways of doing this, 1 is to measure the top frensels focal up from from the top frensel and place a desk lamp, focus that on a table and you should get a combined focal, that will also be shorter then the rear focal but longer then using the rooms light method. The rooms light method was the second lol.
Ok your confused, try the room light method first, measure the distance from the rear frensel to the table, take that and record it, now place your light at that distance.
So say the measurement comes to 118mm, (thats close btw) ok so light is in its box, the rear frensel is 118mm from the lamps arc, both frensels are together.
Now place the lcd on the otherside of the front frensel, place it 10mm infront of the front frensel so we dont get any rings. Also on a side not dont cut your frensel the same size of the lcd as it will be too small, cut it abit bigger, say 5mm.
Ok so now we have the light, the rear frensel at 118mm from the lights arc, the top frensel ontop of the rear frensel together, then we have 10mm to the lcd, so now we are upto the projection lens.
The projection lens will never be at its focal length, this is because of focusing the image on the wall, the bigger the image the shorter the lens will be away from the lcd, the smaller the image the further it will be from the lcd. The best thing to do with any projection lens is to give it a quick test at distances close to its focal, this way we can determine what size of image we can get with what distance. Say you want a 80inch image, well then get your 80inch image focused but have the lens mounted only in the front panel half way, so we will have some leeway to not only focus your intended size, but also if u wanted to go smaller or bigger you can.
The focal on a projection lens u just use a guide, thats it, u cant say that you will get a 100inch image at its designated focal, cos u cant, and u wont, so thats trial and error. Try to also get a top frensel to match your lens as this will ensure the whold image will fit through the lens and will give you a slightly brighter image.
The copy lens works fine on a 320mm so no probs.
I hope it helped abit, prety hard to cover all of your questions in one go lol.
Trev
Member
Joined 2004
thanx ace......alot of info in a short period of time......i have everything except the final projection lens ready to go.......
i just needed to know how things would be spaced so i can begin my case construction......
thanx again..........
i just needed to know how things would be spaced so i can begin my case construction......
thanx again..........
np buddy, dont make the box though until u got the sizes sorted out after you have run a rough test, atleast of the light engine, that way you have less of a chance of screwing up the box being too small when it should have been bigger, i know its frustrating when u want to get started waiting for parts in the mail, ive only had too much of that crap go on lol.
BTW, when cutting a frensel, its measured from the center, the center of the frensel must be in the center of the lcd or you will get very unwanted results lol. Make sure all is centerd in both directions, side to side make sure its centerd and also top the bottom, that way your optics wuill be lined up spot on and you will get a good projected image with each lens working as it should be.
Trev
BTW, when cutting a frensel, its measured from the center, the center of the frensel must be in the center of the lcd or you will get very unwanted results lol. Make sure all is centerd in both directions, side to side make sure its centerd and also top the bottom, that way your optics wuill be lined up spot on and you will get a good projected image with each lens working as it should be.
Trev
Member
Joined 2004
i think the fresnels i have are actually 2 halves.....
they're very thin.....
does a standard fresnel have rings on both sides before being split or is it smooth on one side?....if there's rings on both then i have two halves....if i mount them really close together it should be almost the same as having them whole....should it not......
i held a light in front of them with their smooth sides together and got a focal length of about 240mm.....i think....that's the point at which the light circle was its smallest and sharpest......so, a projection lens of 240mm would be recommended....correct?
they're very thin.....
does a standard fresnel have rings on both sides before being split or is it smooth on one side?....if there's rings on both then i have two halves....if i mount them really close together it should be almost the same as having them whole....should it not......
i held a light in front of them with their smooth sides together and got a focal length of about 240mm.....i think....that's the point at which the light circle was its smallest and sharpest......so, a projection lens of 240mm would be recommended....correct?
Member
Joined 2004
and what do you recommend for cutting the fresnels?
scissors?
utility knife?
axe?
torch?
atom splitter?
thermonuclear warhead?
scissors?
utility knife?
axe?
torch?
atom splitter?
thermonuclear warhead?
Well a torch sounds good to me... maybe not, apparently a router works very well if you need to cut it, but you will need to put tape or something on the side facing the table, so it doesn't get scratched.
For a ohp frensel use a router, for a page magnifyer (the thin things that are only 1 lens) use a razor knife and a strait edge.
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Joined 2004
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