fender4 xblocker
fender4 thanks for posting my pic
xblocker
you were right. i tested last night and it didnt work out. the frensal in front of my tv worked better. thanks anyways
dose any one no a web site/etc. that has info on how lenz work(pictures) and the formulas/math etc. i need to study a bit more
$$$$ idea $$$$
glass bowl paint outside with crome spray paint (reflecktor)
the hole for the light mount im cluelless ????
"i havent tryed nor heared of this idea"
dose any one no about the M59 bulb. thatsmy next light source, maybe.
😀 😀 😀 😀
fender4 thanks for posting my pic
xblocker
you were right. i tested last night and it didnt work out. the frensal in front of my tv worked better. thanks anyways
dose any one no a web site/etc. that has info on how lenz work(pictures) and the formulas/math etc. i need to study a bit more
$$$$ idea $$$$
glass bowl paint outside with crome spray paint (reflecktor)
the hole for the light mount im cluelless ????
"i havent tryed nor heared of this idea"
dose any one no about the M59 bulb. thatsmy next light source, maybe.
😀 😀 😀 😀
a 'M59 bulb' is merely a type of bulb that requires a certain ballast.
The actual things you are looking for when looking to buy a bulb is: wattage, color temperature, bulb life, initial/mean lumen output, bulb size, base type, and CRI (color rendering index).
I got my bulb and ballast today. The ballast looks slightly used, but, I'm cool with it as long as it works. The capacitor is definitely brand new. The bulb is new. However, he quoted me a MS400/U/ED28, and shipped me a MH400/U/ED28. Difference? its either 36,000 or 38,000 instead of 40,000 initial lumens. mean lumens is closer, at about 27,000.
We'll see how it works. For the price, I am happy with what I got. I picked up a Mogul base for $7 even, so my entire metal halide setup was $93 and change. Wow.
The actual things you are looking for when looking to buy a bulb is: wattage, color temperature, bulb life, initial/mean lumen output, bulb size, base type, and CRI (color rendering index).
I got my bulb and ballast today. The ballast looks slightly used, but, I'm cool with it as long as it works. The capacitor is definitely brand new. The bulb is new. However, he quoted me a MS400/U/ED28, and shipped me a MH400/U/ED28. Difference? its either 36,000 or 38,000 instead of 40,000 initial lumens. mean lumens is closer, at about 27,000.
We'll see how it works. For the price, I am happy with what I got. I picked up a Mogul base for $7 even, so my entire metal halide setup was $93 and change. Wow.
Studying for this board exam is KILLING ME!
...or at least it is killing my DIY "career". Priorities--a necessary evil. 😎
No problem, biteon. If you have a pic on your harddrive, just use the "Attach file" option at the bottom of the post page. It will save us thread space next time 😉 .
Sure, a bowl will reflect, but it won't work for us. Unless the designer of the bowl was going through a geometrical/artistic phase that compelled him to make a bowl a mathematically-correct parabola. Doubtful. We are looking for paraboloid or ellipsoid relfectors because those have focal points that allow us to control light from a point-source. Click here, press Ctrl-F, and type "reflector". Read up on all the discussion about reflectors...that will help you more than waiting for an answer here. Learn through the mistakes and successes of others. (not being sarcastic...just practical.) You should also find many links on optics/reflectors the same way. Also go to google.com and type "physics mirror" or something like that.
Undream,
That bulb should be fine...the cool thing is you have a nice ballast! Even if the doesn't work out, you have many options with that ballast. I don't know the specs of it, but Home Depot sells 400watt (LARGE!) bulbs for $20 around here. Good luck with it, and let us know how it goes!
NEED SOME HELP!
Does anyone know where I can get a flawless OHP fresnel for cheap? Mine is barely useable because of wear and age (probably 25 years old). Inventory Solutions won't return my e-mails, so I guess they don't have any. Any suggestions? Thanks.
-f4
...or at least it is killing my DIY "career". Priorities--a necessary evil. 😎
No problem, biteon. If you have a pic on your harddrive, just use the "Attach file" option at the bottom of the post page. It will save us thread space next time 😉 .
Sure, a bowl will reflect, but it won't work for us. Unless the designer of the bowl was going through a geometrical/artistic phase that compelled him to make a bowl a mathematically-correct parabola. Doubtful. We are looking for paraboloid or ellipsoid relfectors because those have focal points that allow us to control light from a point-source. Click here, press Ctrl-F, and type "reflector". Read up on all the discussion about reflectors...that will help you more than waiting for an answer here. Learn through the mistakes and successes of others. (not being sarcastic...just practical.) You should also find many links on optics/reflectors the same way. Also go to google.com and type "physics mirror" or something like that.
Undream,
That bulb should be fine...the cool thing is you have a nice ballast! Even if the doesn't work out, you have many options with that ballast. I don't know the specs of it, but Home Depot sells 400watt (LARGE!) bulbs for $20 around here. Good luck with it, and let us know how it goes!
NEED SOME HELP!
Does anyone know where I can get a flawless OHP fresnel for cheap? Mine is barely useable because of wear and age (probably 25 years old). Inventory Solutions won't return my e-mails, so I guess they don't have any. Any suggestions? Thanks.
-f4
Bye bye
I've stopped reading this thread because at roughly a page a day it's getting too buy to read, when I'm not really concentrating on LCD like you guys are. If anyone wants any info from me or to figure something out then send me a mail. Click on my email thing at the bottom or something. I've not read since page 134 or something.
I'll still drop by and give you some info anyway if I find anything relevant. Sorry if you've already sorted this out.
http://www.leefilters.com do a light temperature conversion range of products, for various reasons like removing UV or converting to daylight temperature, etc. Hope it's useful.
Cheers,
I've stopped reading this thread because at roughly a page a day it's getting too buy to read, when I'm not really concentrating on LCD like you guys are. If anyone wants any info from me or to figure something out then send me a mail. Click on my email thing at the bottom or something. I've not read since page 134 or something.
I'll still drop by and give you some info anyway if I find anything relevant. Sorry if you've already sorted this out.
http://www.leefilters.com do a light temperature conversion range of products, for various reasons like removing UV or converting to daylight temperature, etc. Hope it's useful.
Cheers,
Gunawan,
On page 126 I said facing the LCD towards the light source improved the picture quality (for that setup) not picture brightness. If you read the previous post it was using a slide projector and a simple page reader for a projection lens so it was not like a usual ohp setup. I experimented further and borrowed a very good fresnel from an optometrist and picture sharpness was not far short of using a glass projection lens however the fresnel was too small to give the whole picture, there was very slight colour fringing on the right side of objects and the slide projector lamp burned out so I bought an ohp.
On page 126 I said facing the LCD towards the light source improved the picture quality (for that setup) not picture brightness. If you read the previous post it was using a slide projector and a simple page reader for a projection lens so it was not like a usual ohp setup. I experimented further and borrowed a very good fresnel from an optometrist and picture sharpness was not far short of using a glass projection lens however the fresnel was too small to give the whole picture, there was very slight colour fringing on the right side of objects and the slide projector lamp burned out so I bought an ohp.
Zarks method..
Hello all,
I've been reading this thread for a couple days trying to absorb all this info. This is something I'm definately going to try. I'm most interested in the method posted by Zark. Using an old projection lens and replacing the CRT with an LCD panel. This just seems to make alot of sense to me but, what's the catch? Does anyone know if he was successful? I've allready bought some lenses off ebay and I'm looking to find a 5" LCD panel with more resolution than the one on partsexpress. I guess it would do for video though, and thats all I'm interested in. I like to hear if anyone knows of any sucess with this method.
Best Regards,
John
Hello all,
I've been reading this thread for a couple days trying to absorb all this info. This is something I'm definately going to try. I'm most interested in the method posted by Zark. Using an old projection lens and replacing the CRT with an LCD panel. This just seems to make alot of sense to me but, what's the catch? Does anyone know if he was successful? I've allready bought some lenses off ebay and I'm looking to find a 5" LCD panel with more resolution than the one on partsexpress. I guess it would do for video though, and thats all I'm interested in. I like to hear if anyone knows of any sucess with this method.
Best Regards,
John
and yet another ebay link!
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=1355275406
looks rather interesting - wonder what resolution it is...
still haven't received my panel from america yet..6 weeks and counting 🙁 the guy is trying to track as we speak DOH
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=1355275406
looks rather interesting - wonder what resolution it is...
still haven't received my panel from america yet..6 weeks and counting 🙁 the guy is trying to track as we speak DOH
Hi all,
I just got my Dukane 680 OHP from Inventory Solutions today, and let me tell you it is <b>bright</b>. With a 575W Metal Halide bulb, I was surprised it is so quiet. The aperture of 11.2" is too small for a 15" LCD. I guess it time to take this bad boy apart.
I will post pics if/when I make any progress.
CR
I just got my Dukane 680 OHP from Inventory Solutions today, and let me tell you it is <b>bright</b>. With a 575W Metal Halide bulb, I was surprised it is so quiet. The aperture of 11.2" is too small for a 15" LCD. I guess it time to take this bad boy apart.
I will post pics if/when I make any progress.
CR
ChuckReese said:
i was gonna bid on a 680 on ebay... but then i heard the bulbs were VERY expensive to repalce.
how much would it cost to replace that bulb? the 575W MH?
I don't know how much they cost. I got the whole projector (including bulb) for $150, but I don't know how many hours of life is left on it.
New topic:
The big problem with OHPs is the small aperture size. My dukane only has an 11.2" x 11.2" aperture, but common XGA LCDs are 12" x 9" (with a 15" diagonal). Originally, I had thought of ripping out the fresnel lens and using a bigger one together with an elliptical reflector from Edmund optics. This adds about $300 to the cost of the project (not to mention the time needed to build a new enclosure).
Here is another idea. For an extra $300, I can upgrade my LCD from a VG150 to a VG171. The VG171 is 1280 x 1024, but more importantly, it only has a 17" diagonal; it uses smaller pixels. Using the 11.2" aperature on my OHP, I will still lose pixels (after all it even bigger than the VG150), but because the VG171 has a higher DPI, I can now fit 1024 x768 of those pixels in the 11.2" aperature of my OHP without changing any of the optics. The VG171 also has higher contrast ratio (400:1) which is competitive with low-end LCD projectors.
If this is going to work, I need to find a way to make my computer use only the upper left corner as an XGA display (but still use the native resolution of the LCD). If I can make this happen, it should be as good as using a 15" LCD for the same price. The difference is I would be done as soon as I buy the LCD.
CR
The big problem with OHPs is the small aperture size. My dukane only has an 11.2" x 11.2" aperture, but common XGA LCDs are 12" x 9" (with a 15" diagonal). Originally, I had thought of ripping out the fresnel lens and using a bigger one together with an elliptical reflector from Edmund optics. This adds about $300 to the cost of the project (not to mention the time needed to build a new enclosure).
Here is another idea. For an extra $300, I can upgrade my LCD from a VG150 to a VG171. The VG171 is 1280 x 1024, but more importantly, it only has a 17" diagonal; it uses smaller pixels. Using the 11.2" aperature on my OHP, I will still lose pixels (after all it even bigger than the VG150), but because the VG171 has a higher DPI, I can now fit 1024 x768 of those pixels in the 11.2" aperature of my OHP without changing any of the optics. The VG171 also has higher contrast ratio (400:1) which is competitive with low-end LCD projectors.
If this is going to work, I need to find a way to make my computer use only the upper left corner as an XGA display (but still use the native resolution of the LCD). If I can make this happen, it should be as good as using a 15" LCD for the same price. The difference is I would be done as soon as I buy the LCD.
CR
I have a couple of web site that sell controllers that lets you control a wide range of laptop lcd.
If your computer has a AGP-SPRINT-7 or CoolMonster/P3 video card installed you can control alot of lcds. On the card there is a connector that connects to the lcd. it controls Sharp, Misibitus and whole lot of lcd's
alot of these lcds are on ebay
www.dpie.com/pcbus/jilitechnology.html
(you have to buy the cable from them but they dont give out prices you have to request a quote or something
www.compulab.co.il/586-lcd.htm
they sell embedded computers that control alot lcds, it's a 586 computer for $110
hope this helps a little
If your computer has a AGP-SPRINT-7 or CoolMonster/P3 video card installed you can control alot of lcds. On the card there is a connector that connects to the lcd. it controls Sharp, Misibitus and whole lot of lcd's
alot of these lcds are on ebay
www.dpie.com/pcbus/jilitechnology.html
(you have to buy the cable from them but they dont give out prices you have to request a quote or something
www.compulab.co.il/586-lcd.htm
they sell embedded computers that control alot lcds, it's a 586 computer for $110
hope this helps a little
lmao
what are you guys taliking about? if you LOOK on ebay.com, you WILL FIND an LCD projection panel that has XGA resolution!!
hehe...lmao
aleksey
what are you guys taliking about? if you LOOK on ebay.com, you WILL FIND an LCD projection panel that has XGA resolution!!
hehe...lmao
aleksey
rmccoll,
Thanks for the interesting links. I spent a few minutes looking through datasheets from National Semiconductor that relate to the interfaces you mentioned. I'm a novice when it comes to analog/digital circuits, especially with the myriad of video standards out there. Using one of those cards with a computer to drive it would be a solution, but I would still love to incorporate one of those National chips into a standalone solution for driving a salvaged laptop LCD with an analog video signal.
I can't make heads or tails out of it because of my ignorance, but it seems like some clever mating of a couple of chips (one of these interface chips with a NTSC/monitor driver chip...also from National, I think), it seems like it could be possible. If we could find a source for high-rez, compatible laptop LCDs (I'm sure they're out there) and get an electrical whiz to figure out the analog/digital interface, we would be in business.
Until then, I'll keep playing with my low-fi OHP panel 🙄 . It works, but if you are anything like me, nothing is ever good enough 😀 .
Chuck,
Congrats on the OHP! It sounds nice. If I were you, I would just use the 15" with the image scaled down slightly to fit the OHP stage. It sounds like any other option might get expensive...approaching used LCD projector range 😱 . But I completely understand the DIY mentality, so go for it if you have the means! Good luck to you.
-f4
Thanks for the interesting links. I spent a few minutes looking through datasheets from National Semiconductor that relate to the interfaces you mentioned. I'm a novice when it comes to analog/digital circuits, especially with the myriad of video standards out there. Using one of those cards with a computer to drive it would be a solution, but I would still love to incorporate one of those National chips into a standalone solution for driving a salvaged laptop LCD with an analog video signal.
I can't make heads or tails out of it because of my ignorance, but it seems like some clever mating of a couple of chips (one of these interface chips with a NTSC/monitor driver chip...also from National, I think), it seems like it could be possible. If we could find a source for high-rez, compatible laptop LCDs (I'm sure they're out there) and get an electrical whiz to figure out the analog/digital interface, we would be in business.
Until then, I'll keep playing with my low-fi OHP panel 🙄 . It works, but if you are anything like me, nothing is ever good enough 😀 .
Chuck,
Congrats on the OHP! It sounds nice. If I were you, I would just use the 15" with the image scaled down slightly to fit the OHP stage. It sounds like any other option might get expensive...approaching used LCD projector range 😱 . But I completely understand the DIY mentality, so go for it if you have the means! Good luck to you.
-f4
4th element lens
This is the 4th element wide angle lens that is used with the Dukane quantum projector, it is a single sided convex and I have no idea what its focal point is I shined a light through it and it never came to a point. If I get a concave lens would it have the opposite effect as this lens? Here are some photos of it.
This is the 4th element wide angle lens that is used with the Dukane quantum projector, it is a single sided convex and I have no idea what its focal point is I shined a light through it and it never came to a point. If I get a concave lens would it have the opposite effect as this lens? Here are some photos of it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
fender4 said:
Not likely as XGA LCD projectors start at $4k and go up from there.
However, I have decided to go with a 13.8" laptop LCD that has XGA and good contrast ratio since these also have high DPI. I think earthlcd has these in inventory, but they just list part numbers. I have been having a really hard time finding one that would work, since most laptop LCDs only do 262k colors. After I find one, I still have to figure out how to drive it, and from reading this thread it appears to be nontrivial.
I need:
13.3 - 13.8" TFT XGA LCD with 16.7M colors and 300:1 contrast.
Does anyone have a line on one of these?
CR
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