last pictures
Here a picture of the result, obtained with the strong condenserlens setup. (it's not exactly the same, but it gives an impression)
When the ir/uv filter is here, I would like to test the three light setups (1. the wrinkled ellipsoidal 🙂 2. the "strong condenser" setup 3. the sperical setup), using three times the same (halogen) lamp, that can be replaced by a uhp or CDM-t powerball for the 'real' setup. It should be interesting to use different fresnels. Btw, the diameter of the lcd = 7".
So, that's it for today, and now back to work! 😉
bye bye!
Here a picture of the result, obtained with the strong condenserlens setup. (it's not exactly the same, but it gives an impression)
When the ir/uv filter is here, I would like to test the three light setups (1. the wrinkled ellipsoidal 🙂 2. the "strong condenser" setup 3. the sperical setup), using three times the same (halogen) lamp, that can be replaced by a uhp or CDM-t powerball for the 'real' setup. It should be interesting to use different fresnels. Btw, the diameter of the lcd = 7".
So, that's it for today, and now back to work! 😉
bye bye!
Attachments
[reflector+lamp] --- [strong condenser] --- // ---[second condenser]
ps: maybe someone else already tried this setup and already explained it accurately. Then this post would be unnecessary,
but if it helps someone, it would be cool! This forums helped me a lot too.
And it is not me who invented this setup, but "matthias" 🙂
hmm, now i REALLY have to start working.
ps: maybe someone else already tried this setup and already explained it accurately. Then this post would be unnecessary,
but if it helps someone, it would be cool! This forums helped me a lot too.
And it is not me who invented this setup, but "matthias" 🙂
hmm, now i REALLY have to start working.
Attachments
I tried something similar, I used a normal precon with focal length 90mm, diameter 72mm and an aspheric lens that came out of a LitePro 550 (no idea of the specs, diam about 65mm)
Unfortunately I did not get an even spread of light so I don't think my aspheric lens is correct lens to use here
Will test with lenses from 8mm slide projector when I get one
Unfortunately I did not get an even spread of light so I don't think my aspheric lens is correct lens to use here
Will test with lenses from 8mm slide projector when I get one
Attachments
I tried it with another "strong" condenser too, but it didn't work neither. The only lens that did the job was the slide projector-lens. You'll have to test a bit with the position of the "strong" slideprojector-condenser, if it is too close to the reflector, you obtain a sharp projection of the curves of the reflector, very beautiful, but not useful.
🙂
🙂
here's some pics of my ellipsoidal reflector. I'm still trying to get the arc in the exact point. I believe there should be a small black dot in the center of the light cone, but I've moved it just slightly back so that it is not visible. In the pics, I also had a precondensor placed in fromt of the lamp to see what happens. The circle of light spread open, but the center of the lamp became much "clearer" and can clearly see the shell of the lamp. I tested at different lengths as well as having flat side of lense facing towards and facing away from the lamp.
http://picasaweb.google.com/giorgos18/EllipsoidalLamp#
http://picasaweb.google.com/giorgos18/EllipsoidalLamp#
this seems to be very efficient light use! Did you try it in your pj, with lcd?
I am waiting for a new cold reflector and a new screen (12 inch). This will be a reason to try other elliptical light setups, as the lcd surface is a bit bigger now..
Did the slideprojector lens setup work with the elliptical reflector?
Bye
I am waiting for a new cold reflector and a new screen (12 inch). This will be a reason to try other elliptical light setups, as the lcd surface is a bit bigger now..
Did the slideprojector lens setup work with the elliptical reflector?
Bye
nope, not yet, have not tried anything in my projector (work work work!!!)
I did not win original slide projector (it was hijacked from my bid, 5 minutes before ending time!) but I am getting another one which should arrive sometime this week, so I'll take it apart only then
I also ordered the following for about 35 USD incl shipping
http://www.surplusshed.com/pages/item/m2407.html
I'll see if I can use the mirror and lens in my assembly.
I was tempted to go and buy a large lamp like yours and do an aluminium test since your results were good! I'd like to try it still...
I did not win original slide projector (it was hijacked from my bid, 5 minutes before ending time!) but I am getting another one which should arrive sometime this week, so I'll take it apart only then
I also ordered the following for about 35 USD incl shipping
http://www.surplusshed.com/pages/item/m2407.html
I'll see if I can use the mirror and lens in my assembly.
I was tempted to go and buy a large lamp like yours and do an aluminium test since your results were good! I'd like to try it still...
Wow, that slide projector assembly could be very efficient! Why shouldn't you use to reflector too? If there is only a strong condenser in it, (50mm wide, 55mm long), I guess you should place another condenser 'after' it to control the aperture angle of the light.
The "winning light setup" 🙄 will be this one (with slide projector assembly), or the alluminium foil one. I'll do some more tests next weekend!
There are some other possibilities for the elliptical setup:
- reflector from beamerlamp that doesn't work anymore (=cold reflector)
- reflector from "elliptical energysaver lamp", found on ebay: http://cgi.benl.ebay.be/Longlife-En...hash=item370054205687&_trksid=p3286.m63.l1177
but shipping costs are extremely high just for "testing" it. And I can't find such a lamp in Belgium.
ps: the lamp used for the aluminium foil was a 250W MBFU mercury lamp.
I also tried to make one in polyester, but the resin can't stand the heat..
The "winning light setup" 🙄 will be this one (with slide projector assembly), or the alluminium foil one. I'll do some more tests next weekend!
There are some other possibilities for the elliptical setup:
- reflector from beamerlamp that doesn't work anymore (=cold reflector)
- reflector from "elliptical energysaver lamp", found on ebay: http://cgi.benl.ebay.be/Longlife-En...hash=item370054205687&_trksid=p3286.m63.l1177
but shipping costs are extremely high just for "testing" it. And I can't find such a lamp in Belgium.
ps: the lamp used for the aluminium foil was a 250W MBFU mercury lamp.
I also tried to make one in polyester, but the resin can't stand the heat..
Attachments
spherical vs. elliptical
I tried the two setups, with same fresnels and triplet-lens.
note: the elliptical setup is not so very sofisticated: aluminium foil coated shape of a half ellipsoid, in cement.
The not scientific but real results:
1. elliptical= brighter (can't tell in lux or lumen)
2. elliptical= more heat, difficult to handle, but there is a plan.
3. elliptical gives a "bigger" spot at the focal point of the second fresnel. The triplet (diameter: 6 cm) couldn't "take" all the light.
<-->With a spherical setup, the lightspot in the focal point of the second fresnel is much more concentrated, but:
the light output of the elliptical reflector is still higher, even when the triplet can't "take" all the light.
(a bigger triplet with a +/- 10cm diameter would be great.. But I don't know where to find those not-so-very-cheap lenses)
I'll try to handle the heat with a mirror-heatsink system. I don't know if it will work, we will see!
I tried the two setups, with same fresnels and triplet-lens.
note: the elliptical setup is not so very sofisticated: aluminium foil coated shape of a half ellipsoid, in cement.
The not scientific but real results:
1. elliptical= brighter (can't tell in lux or lumen)
2. elliptical= more heat, difficult to handle, but there is a plan.
3. elliptical gives a "bigger" spot at the focal point of the second fresnel. The triplet (diameter: 6 cm) couldn't "take" all the light.
<-->With a spherical setup, the lightspot in the focal point of the second fresnel is much more concentrated, but:
the light output of the elliptical reflector is still higher, even when the triplet can't "take" all the light.
(a bigger triplet with a +/- 10cm diameter would be great.. But I don't know where to find those not-so-very-cheap lenses)
I'll try to handle the heat with a mirror-heatsink system. I don't know if it will work, we will see!
fantastic! I have a nice large triplet to play with so hopefully can capture that light that is not making it. Did the light at least fill the entire screen evenly?
As for the ebay link about the elliptical lamp, try visiting some light stores, you should be able to find something. I have seen similar lamps here in south africa, so if we can find them here surely they must be readily available in Belgium
But thanks for the update!
As for the ebay link about the elliptical lamp, try visiting some light stores, you should be able to find something. I have seen similar lamps here in south africa, so if we can find them here surely they must be readily available in Belgium
But thanks for the update!
If you adjust the position of the lamp a little bit out of focus, the lightbeam widens a bit and the complete fresnel is lightened up evenly.
But the mirror-heatsink idea isn't that easy, it seems that I lose a lot af light. I don't know why.. The reflector seems te be really close to the fresnel, that is, in fact, very good. But the heat is too much and a IR/UV filter isn't 'strong' enough..
With the mirror, the distance between the reflector and the fresnel is increases..
And I just broke my lamp 🙁 , it was 'just' a 150W HQI-TS test lamp, but now I have to work again with the 35W hqi-t and the results of that lamp are not very "wow, what a light engine!"
I'll post some pics if the mirror-heatsink thing should work
bye
But the mirror-heatsink idea isn't that easy, it seems that I lose a lot af light. I don't know why.. The reflector seems te be really close to the fresnel, that is, in fact, very good. But the heat is too much and a IR/UV filter isn't 'strong' enough..
With the mirror, the distance between the reflector and the fresnel is increases..
And I just broke my lamp 🙁 , it was 'just' a 150W HQI-TS test lamp, but now I have to work again with the 35W hqi-t and the results of that lamp are not very "wow, what a light engine!"
I'll post some pics if the mirror-heatsink thing should work
bye
got the 8mm slide projector in today, but there's practically no useful lenses or anything of use inside it. Just uses a fan for cooling and a "triplet" type zoom lens for projection. That's it. (sucks)
Lucky it was very cheap 🙂
So now I'm waiting for that light engine assembly to arrive and I ordered an concave lens as well to experiment with and see what happens. Also, have a spare triplet that I'm thinking of taking apart to see if I can use any of the lenses inside
Lucky it was very cheap 🙂
So now I'm waiting for that light engine assembly to arrive and I ordered an concave lens as well to experiment with and see what happens. Also, have a spare triplet that I'm thinking of taking apart to see if I can use any of the lenses inside
it was from a local guy here in Cape Town. The Projector was an 8mm Cinekon S80 slide projector that I was hoping to get some lenses and heat filters out of. But unfortunately it had none of that. The local shipping cost was about 4USD at current conversion rate
So now I'm getting this light engine to play with : http://www.surplusshed.com/pages/item/m2407.html and concave lens. Shipping for that and an extra lens is 22USD
The lamps you got me are very bright, but they give off incredible heat. So for now I have to first learn to control the heat using cold mirrors and fans. But we're getting incredible results here! vandervoordekoen's aluminium results alone show incredible promise.
I'm currently using a normal halogen reflector (38 degrees), but it doesn't cover large LCD. Need to play some with some lenses to spread the beam. Any ideas ywh?
So now I'm getting this light engine to play with : http://www.surplusshed.com/pages/item/m2407.html and concave lens. Shipping for that and an extra lens is 22USD
The lamps you got me are very bright, but they give off incredible heat. So for now I have to first learn to control the heat using cold mirrors and fans. But we're getting incredible results here! vandervoordekoen's aluminium results alone show incredible promise.
I'm currently using a normal halogen reflector (38 degrees), but it doesn't cover large LCD. Need to play some with some lenses to spread the beam. Any ideas ywh?
no updates yet - still waiting for new lenses to arrive and work has been very busy, so not much projector work done!
about a fresnel less projector
I am trying to construct a projector without fresnel lens.
'm getting the experience here.
The site is in Spanish. but with the help of google translator.
http://www.proyectordiy.com/e107_plugins/forum/forum_viewtopic.php?19398
I am trying to construct a projector without fresnel lens.
'm getting the experience here.
The site is in Spanish. but with the help of google translator.
http://www.proyectordiy.com/e107_plugins/forum/forum_viewtopic.php?19398
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