mycamel,
Your analyses are excellent, and your use of contact processing and the hand shadow as a tool to manipulate and illustrate the concepts involved here is inspired.
Everybody uses metaphors and concepts they are familiar with as tools to explore the unknown. The more diverse the metaphors and concepts that are brought to the fore in these discussions, the more angles on the same issue we will all see.
Sometimes I liken the process of discovery to the tale of the blind men and the elephant: each picking a different feature of the elephant to explore, reported the elephant to be something different. One, feeling the elephant's tail, thought the elephant was like a rope; another, feeling its leg, thought it to be like a tree; another, feeling the elephant's trunk thought it was like a snake; and so on...
The thing that blows me away about what is going on here is that multiple people from all over the world are able to contribute their own little piece to a project that is driven from a pure desire to solve a problem: it is not for money, or fame, or even just to have a working device - many of us already have a working device of one sort or another, but we all still want to solve the problems and achieve something cool.
Forgive me guys for getting heavy, but do you all realise that this is the first period in recorded human history that such an effort - not sponsored or controlled by any university, industry or government - has ever happened?
Normal people from all over the world collaborating and contributing what they can just to taste success...
At this rate, the blind men will all soon be able to share the true understanding of the elephant...
Cool!!!
Bill.
P.S. No, I'm not smoking anything, I'm just tired and shouldn't be posting things so late... 😉
Your analyses are excellent, and your use of contact processing and the hand shadow as a tool to manipulate and illustrate the concepts involved here is inspired.
Everybody uses metaphors and concepts they are familiar with as tools to explore the unknown. The more diverse the metaphors and concepts that are brought to the fore in these discussions, the more angles on the same issue we will all see.
Sometimes I liken the process of discovery to the tale of the blind men and the elephant: each picking a different feature of the elephant to explore, reported the elephant to be something different. One, feeling the elephant's tail, thought the elephant was like a rope; another, feeling its leg, thought it to be like a tree; another, feeling the elephant's trunk thought it was like a snake; and so on...
The thing that blows me away about what is going on here is that multiple people from all over the world are able to contribute their own little piece to a project that is driven from a pure desire to solve a problem: it is not for money, or fame, or even just to have a working device - many of us already have a working device of one sort or another, but we all still want to solve the problems and achieve something cool.
Forgive me guys for getting heavy, but do you all realise that this is the first period in recorded human history that such an effort - not sponsored or controlled by any university, industry or government - has ever happened?
Normal people from all over the world collaborating and contributing what they can just to taste success...
At this rate, the blind men will all soon be able to share the true understanding of the elephant...
Cool!!!
Bill.
P.S. No, I'm not smoking anything, I'm just tired and shouldn't be posting things so late... 😉
woneill
ever heard of Linux? I'd love to see that work(or any open source OS) way more than have a big TV.
P.s.--i know it "works" but i'd like to stop giving my money to microsoft altogether--but i agree, it's late and i probably shouldn't post at all
ever heard of Linux? I'd love to see that work(or any open source OS) way more than have a big TV.
P.s.--i know it "works" but i'd like to stop giving my money to microsoft altogether--but i agree, it's late and i probably shouldn't post at all
Linux...
Icculus,
Linux is an EXCELLENT OS. I have been playing with it since the early 90s and it is almost ready for prime-time!!! (Don't need to be a UNIX guru to use it anymore...)
The only problem in this context is that for HTPC, there aren't always the latest drivers for the coolest video hardware...
Bill.
Well worth playing with, though!!!
Icculus,
Linux is an EXCELLENT OS. I have been playing with it since the early 90s and it is almost ready for prime-time!!! (Don't need to be a UNIX guru to use it anymore...)
The only problem in this context is that for HTPC, there aren't always the latest drivers for the coolest video hardware...
Bill.
Well worth playing with, though!!!
Yeah, with linux the only real problem lies in driver support. The OS has huge potential and you get away from the BSOD from MicroCrap products.
LCD protection idea
I've been thinking this for a while, and it might help out those with LCD panel heat problems.
the first part of an LCD panel is a polarizer. This reduces the light level by passing only light of the correct polarization. The rest of the light is absorbed, and converted to heat. If you used polarizing film(available from edmond optics, I think) in the same orientation as the first polarizer in the LCD, but placed it _between_ the light source and the LCD, the light that would not go through the lcd anyway would be absorbed by that polarizer, reducing the heat on the LCD panel. This would be ideal if you could find a high-temperature polarizing material.
Make any sense?
I've been thinking this for a while, and it might help out those with LCD panel heat problems.
the first part of an LCD panel is a polarizer. This reduces the light level by passing only light of the correct polarization. The rest of the light is absorbed, and converted to heat. If you used polarizing film(available from edmond optics, I think) in the same orientation as the first polarizer in the LCD, but placed it _between_ the light source and the LCD, the light that would not go through the lcd anyway would be absorbed by that polarizer, reducing the heat on the LCD panel. This would be ideal if you could find a high-temperature polarizing material.
Make any sense?
makes great sense, but what orientation do you have to do? And how much light is lost by the additional polarizer? We already have the efficiency problem, I do like the idea but I dont know enough about polarization to work with it
From what I've seen using polarizers, the light loss should be minimal. If you take two identical polarizing sheets and put them together, there shouldn't be much difference in terms of light transmission from only having one polarizer. ( however, If you turn one sheet 90 degrees relative to the other one, it should block out most light) So, this is just a way of relocating part of the lcd system to reduce heat on the actual display. The polarizer in the LCD sees ONLY the portion of the light it would let through anyway. THis means that it won't absorb as much light, keeping it and the liquid crystals cooler! It's not getting rid of heat- the first polarizer should get pretty hot, as it is absorbing half of the light.
one more thing:
you would have to experiment rotating the polarizer until you got the maximum output through the LCD...
you would have to experiment rotating the polarizer until you got the maximum output through the LCD...
i think!!!
tell me if this makes "us" look stuppid.
i went to the drive in movie theather last night. this is what i saw.
20'x40' (about)screen, 50-75 yards back was the room with the projectors. i went to get a look at the projectors and so some thing intressting. the roll of film is only 2" wide. that means the the light source is only about 1"x2" max. "how the f**k is that ?."
#1 thats alot of screen to cover.
#2 thats a long distance to cover.
#3 the light travels out side where theres dust mist etc.
#4 this drive in is by the ocean( more mist at night)
is it possible that the light bulb for this projector is small like the 2" wide film?.
sorry but that just blows my mind.
p.s. they had a big cooling system. 7' diameter pipes from the ceiling to the projectors. im guessing they might use air conditioning.
😀 😀 😀 😀
tell me if this makes "us" look stuppid.
i went to the drive in movie theather last night. this is what i saw.
20'x40' (about)screen, 50-75 yards back was the room with the projectors. i went to get a look at the projectors and so some thing intressting. the roll of film is only 2" wide. that means the the light source is only about 1"x2" max. "how the f**k is that ?."
#1 thats alot of screen to cover.
#2 thats a long distance to cover.
#3 the light travels out side where theres dust mist etc.
#4 this drive in is by the ocean( more mist at night)
is it possible that the light bulb for this projector is small like the 2" wide film?.
sorry but that just blows my mind.
p.s. they had a big cooling system. 7' diameter pipes from the ceiling to the projectors. im guessing they might use air conditioning.
😀 😀 😀 😀
I used to work in a theatre way back when.....these things use massive bulbs....the film is only 2 inches wide, but the bulbs are a bit bigger...typically xenon or used to be carbon arc lamps.......we can't and shouldn't even think about these.....they produce a lot of heat and the power supplies required are huge, and the bulbs easily cost 1000$ each.
Nice thought though
Nice thought though
I'm looking for a dead ellipsoidal fixture to throw a 250 or 400 watt MH into and project the light into a proxima dp5100 lcd projector......i have an OHP with a TVT right now
eebasist
i put abunch of pictures and a plan of what im doing on page 19.
take a look tell me if you see any potentchle problems or what you think about it (advise). thanks
😀 😀 😀 😀
i put abunch of pictures and a plan of what im doing on page 19.
take a look tell me if you see any potentchle problems or what you think about it (advise). thanks
😀 😀 😀 😀
Nice setup.....now comes the fun part, seeing if it will work...only comment i really have is the bulb orientation......is the bulb meant for a horizontal burn....if its not it will lead a much shorter life.....Have you determinined the proper spacing between the light, fresnel and lcd....each reflector/bulb combination are different and can cause you to have a good, crappy, or awesome projected image.....Marklar set his up on a table and then arranged the lights to make the best image.
What lens are you using to project the image?
What lens are you using to project the image?
Re: i think!!!
Have a look at this theater projector. Down at the botom of the page it shows the lamp and reflector used. These run up to 7kw as opposed to our 'tiny' 400w units!
biteon said:
Have a look at this theater projector. Down at the botom of the page it shows the lamp and reflector used. These run up to 7kw as opposed to our 'tiny' 400w units!
eebasist said:
I'm trying that route myself. I found a 10" with 1kw bulb on eBay (~$63 including shipping) and should be receiving it soon. What I hope I can do is modify the reflector to accept my 400w MH.
I figure on turning it upwards, running the beam through a sheet of that IR Blocking film, through a fresnel after the LCD and into the optics from my current OHP. Due to the length of the fixture, I may have to lay it down and bounce it off a mirror. We'll see.
I figure the ellipsoidal reflector should already be optimized for a non-point source being that the 1kw bulb filament it normally uses is rather long. All the focal length math should already be done too. Hopefully I'll get lots of useful light out the front of this animal.
the bulb is universal(400mh/u). meaning any postion.
the disstance dim. dont realy matter to me cause i got more than enough room in the box to F around. but this is kinda what im planing to do with the lenses and the low-e glass.
low-e glass is going to be set about 1/2" - 1" from the reflector so theres enough room for the air to rotate for cooling reasons.
the first fresnel lenses is placed as close as possible to the low-e glass so it catches most of the light from the reflector and sends the light basically striat forward.
the second fresnel is to consentrate all/most of that light on just the lcd(ill lose some light cause the light coming out of the second fresnel is a circle and the lcd is a rectangle, im going to lose about 1/3 of my light there but it dosent matter to me cause ive allready tryed it and it still worked out pertty good.)
im using a delta IV projection lens i works but the way the lenses are setup the lens has to almost touch the lcd to project a good focus picture there fore meaning the lens has to be bigger than the lcd. un less you modify, but i havent tryed that just yet. i think it will work out with my 5.6" lcd. im going to lunch later.
😀 😀 😀 😀
the disstance dim. dont realy matter to me cause i got more than enough room in the box to F around. but this is kinda what im planing to do with the lenses and the low-e glass.
low-e glass is going to be set about 1/2" - 1" from the reflector so theres enough room for the air to rotate for cooling reasons.
the first fresnel lenses is placed as close as possible to the low-e glass so it catches most of the light from the reflector and sends the light basically striat forward.
the second fresnel is to consentrate all/most of that light on just the lcd(ill lose some light cause the light coming out of the second fresnel is a circle and the lcd is a rectangle, im going to lose about 1/3 of my light there but it dosent matter to me cause ive allready tryed it and it still worked out pertty good.)
im using a delta IV projection lens i works but the way the lenses are setup the lens has to almost touch the lcd to project a good focus picture there fore meaning the lens has to be bigger than the lcd. un less you modify, but i havent tryed that just yet. i think it will work out with my 5.6" lcd. im going to lunch later.
😀 😀 😀 😀
Re: Re: i think!!!
is it just me or is the light facing the opposite way to where it should be
what would make this position more efficient? or is it less efficient?
mycamel said:
is it just me or is the light facing the opposite way to where it should be
An externally hosted image should be here but it was not working when we last tested it.
what would make this position more efficient? or is it less efficient?