hmmm....
Hello all, I recently purchased the IO DATA A15V and haev subsequently striped it down.
Pretty easy to do and i will try and attach pictures on my next post if anyone is interested.
But help...
While mucking around i scratched the panel with a fresnel lens (dumb i know) and now when it projects i get a black scratch mark.
I was wondering if i had perhaps scratched the polarising film???
if so could i remove it all and replace it with a sheet of polarising film from a photography shop or something...don't really want to remove it at the moment as it seems like i will just get a black picture without it...
For the love of all that is good could someone please help me out here
Thanks
Hello all, I recently purchased the IO DATA A15V and haev subsequently striped it down.
Pretty easy to do and i will try and attach pictures on my next post if anyone is interested.
But help...
While mucking around i scratched the panel with a fresnel lens (dumb i know) and now when it projects i get a black scratch mark.
I was wondering if i had perhaps scratched the polarising film???
if so could i remove it all and replace it with a sheet of polarising film from a photography shop or something...don't really want to remove it at the moment as it seems like i will just get a black picture without it...
For the love of all that is good could someone please help me out here
Thanks
hi @ all,
here are the results of my projector;
the last picture is horrible, i will post more real projected pictures nextime, with a better digi cam. then i will use a anamorphic lense too...
till then
with best regards
slize
here are the results of my projector;
the last picture is horrible, i will post more real projected pictures nextime, with a better digi cam. then i will use a anamorphic lense too...
till then
with best regards
slize
reflector idea
I was wondering if it is possible to create a point light sourse by taking a small parabolic reflector from a studio like such as this
then use a condencer lense from the suplus shed to focus the light into a point. My current fears are that:
a) Aspherical aberation
b) heat
c) will a 400W bulb fit in this reflector.
The reflector pictured is only 5" in diameter but the site that I found the reflector at also sells a 7" diameter model. The reason i am leaning towards the 5" model is because the suplus shed sells a 4-7/16 " condencer lens and this lens when paired with the 5" model should (I think) be more effiecent.
I'm willing to give it a shot but I would like to know if this sounds reasonable before I try it.
Any help would be GREATLY appreciated.
I was wondering if it is possible to create a point light sourse by taking a small parabolic reflector from a studio like such as this
An externally hosted image should be here but it was not working when we last tested it.
then use a condencer lense from the suplus shed to focus the light into a point. My current fears are that:
a) Aspherical aberation
b) heat
c) will a 400W bulb fit in this reflector.
The reflector pictured is only 5" in diameter but the site that I found the reflector at also sells a 7" diameter model. The reason i am leaning towards the 5" model is because the suplus shed sells a 4-7/16 " condencer lens and this lens when paired with the 5" model should (I think) be more effiecent.
I'm willing to give it a shot but I would like to know if this sounds reasonable before I try it.
Any help would be GREATLY appreciated.
Does not sound right to me as the parabolic reflector should produce a 5" or 7" diameter parallel beam of light, not a beam that focuses to a small point (that is required to use the condenser lens).
Ken
Ken
chbright
if that reflector puts out the required width of beam u wont need a condenser, all a condenser does is not only magnify the light but its used to widen the bean to the desired width, if the beam is wide enough for u just use a frensel to help distribute the light evenly over the panel and it will also magnify the light. Bulbs that have a small burning ark are better because they have a much more brighter light and it is more controlable, that is when u use a condensing lens, and the reflector in a ohp is only small because all it is doing is just guideing light from a small ark and its just there to reflect the light from the back of the bulb to the condenser so u have less wastage of light or u could say using more of the light, now what doesnt go through the condenser lens from the reflector will go through the frensel anyway so the losses in a ohp is very small.
goodluck in what your going to try and let us know how u go with it
Trev
if that reflector puts out the required width of beam u wont need a condenser, all a condenser does is not only magnify the light but its used to widen the bean to the desired width, if the beam is wide enough for u just use a frensel to help distribute the light evenly over the panel and it will also magnify the light. Bulbs that have a small burning ark are better because they have a much more brighter light and it is more controlable, that is when u use a condensing lens, and the reflector in a ohp is only small because all it is doing is just guideing light from a small ark and its just there to reflect the light from the back of the bulb to the condenser so u have less wastage of light or u could say using more of the light, now what doesnt go through the condenser lens from the reflector will go through the frensel anyway so the losses in a ohp is very small.
goodluck in what your going to try and let us know how u go with it
Trev
so would going with something like this reflector work better and maybe eliminate the need for the rear fresnel if i split an ohp fresnel?
P.S.
Is this a good deal for this type of reflector?
P.S.
Is this a good deal for this type of reflector?
chbright
if u take away a frensel your light must be diffused, if it isnt diffused enough u will get hot spots on the screen showing on the projected image, a hot spot is a bright patch like the center of the image is brighter than the side's , the best person to speak to about this is probally proto5 he has a great setup and he could help u with your answers more than me as im building mine from scratch with abit of diff technology for a different system
Trev
if u take away a frensel your light must be diffused, if it isnt diffused enough u will get hot spots on the screen showing on the projected image, a hot spot is a bright patch like the center of the image is brighter than the side's , the best person to speak to about this is probally proto5 he has a great setup and he could help u with your answers more than me as im building mine from scratch with abit of diff technology for a different system
Trev
my experiences with reflectors show, that it doesn't only guide the light to the fresnel, but it will also guide the heat to the fresnel and to the lcd. and this is a major problem; at least it was for me; the reflector (looked like this shown one) put all the heat to the lcd panel and it gets that hot that pixels began to shut; the picture got darker and darker; and I wouldn't say that it has such great advantages compared to the picture without the the reflector; there the big advantage is the lcd stays cool and there is enough light.
I will post pics of projected pics next week; as soon as I get the digi cam again, and i've finished my anamorph lense for the projector.
best regards
slize
I will post pics of projected pics next week; as soon as I get the digi cam again, and i've finished my anamorph lense for the projector.
best regards
slize
slize
yeah your right slize the reflector throws all of the heat at the lcd too, anyway that lcd that got darker and darker did it come back to normal? also what bulb type wer u using and did u have a uv filter?
Trev
yeah your right slize the reflector throws all of the heat at the lcd too, anyway that lcd that got darker and darker did it come back to normal? also what bulb type wer u using and did u have a uv filter?
Trev
yeah luckily it came back to normal; i used a 400W MH bulb and didn't use a uv filter, because the heat doesn't come from the uv-rays but from the ir-rays...
slize
yeah thats right about the uv containing any heat but ill warn that it has some and its penertrating heat not radiant like ir, also if u havnt done it already i would filter the light with a uv filter cos the lcd will go black in time and break down from the uv rays, anyway great to hear that you got your screen back and good luck diy
Trev
yeah thats right about the uv containing any heat but ill warn that it has some and its penertrating heat not radiant like ir, also if u havnt done it already i would filter the light with a uv filter cos the lcd will go black in time and break down from the uv rays, anyway great to hear that you got your screen back and good luck diy
Trev
oops
In my previous post I meant to post a link to this reflector , not the other reflector.
This should give me the effect of using a point light source and a fresnel, right?
Sorry for my incompetence .
In my previous post I meant to post a link to this reflector , not the other reflector.
This should give me the effect of using a point light source and a fresnel, right?
Sorry for my incompetence .
trev
you're sure about that? i mean the lcd will get damaged without an uv filter? how it comes that an ohp has no uv filter and you can run an lcd on it without the warning that it will get damaged? Did u already experienced that effect?
slize
you're sure about that? i mean the lcd will get damaged without an uv filter? how it comes that an ohp has no uv filter and you can run an lcd on it without the warning that it will get damaged? Did u already experienced that effect?
slize
trev
because of the uv filter; as far as i remember a simple glas is sufficant as an uv filter... i remember how my physics teacher told us we can't get brown skin if we're sitting in the room, because the glas filters out the uv rays, and only the ir rays go through that's why romms are heaten up in the summer... and i have 4 glas before the lcd...
slize
because of the uv filter; as far as i remember a simple glas is sufficant as an uv filter... i remember how my physics teacher told us we can't get brown skin if we're sitting in the room, because the glas filters out the uv rays, and only the ir rays go through that's why romms are heaten up in the summer... and i have 4 glas before the lcd...
slize
slize
yeah its somthiong im looking into about the uv im not a full bid on it, but since ive put perspex infront of my light it has made the lcd cooler somwhat and i got that idea out of the forum, wheather it is a uv filter im not sure, but with uv i know its a penitrating light source and that is why it damages things, about the heat from it the only change i noticed is whith the perspex, but forsure the radiant heat is in ir, ir is the one we need to kill the most as in heat, with the uv damaging the lcd or discolourising it ive gotten that info out of here too so it isnt probally too acurate, but i think with such a strong uv source light a 400w mh, it might damage the lcd over time. Glass as uv filter im not too sure about because now days u can get mh bulbs with a uv filter built in, now if glass blocked uv why do they need the filter? lol maybe glass blocks a small amount, who knows, i know i dont , but anyway maybe u could help us out here and give us some coments or answer's.
Best regards Trev
yeah its somthiong im looking into about the uv im not a full bid on it, but since ive put perspex infront of my light it has made the lcd cooler somwhat and i got that idea out of the forum, wheather it is a uv filter im not sure, but with uv i know its a penitrating light source and that is why it damages things, about the heat from it the only change i noticed is whith the perspex, but forsure the radiant heat is in ir, ir is the one we need to kill the most as in heat, with the uv damaging the lcd or discolourising it ive gotten that info out of here too so it isnt probally too acurate, but i think with such a strong uv source light a 400w mh, it might damage the lcd over time. Glass as uv filter im not too sure about because now days u can get mh bulbs with a uv filter built in, now if glass blocked uv why do they need the filter? lol maybe glass blocks a small amount, who knows, i know i dont , but anyway maybe u could help us out here and give us some coments or answer's.
Best regards Trev
Projection lens
Hi...
I don't see many examples of a setup like this:
Spotlight---> fresnel----> lcd panel---->
Projection Lens----> screen
Where the spotlight is one of these 500W - 2000W Dj spotlight the kind you find in DJ equipment stores or Theater equipment stores (also known as Fresnel Spotlights).....
And the Projection lens is the kind you find for film projectors (moving films, slides, etc...like this one Lens
)
Can someone point me to someone's project that has a setup like this or tell me if they know of this kind of setup being successful?
Thanks
Hi...
I don't see many examples of a setup like this:
Spotlight---> fresnel----> lcd panel---->
Projection Lens----> screen
Where the spotlight is one of these 500W - 2000W Dj spotlight the kind you find in DJ equipment stores or Theater equipment stores (also known as Fresnel Spotlights).....
And the Projection lens is the kind you find for film projectors (moving films, slides, etc...like this one Lens
)
Can someone point me to someone's project that has a setup like this or tell me if they know of this kind of setup being successful?
Thanks
reason is that those dj and theatre lights (90% of more of them) use a halogen bulb of high wattage and low life. You'll typically see a 600-1000 W halogen bulb in there with a life of 75 hours on them and they cost 20-50 dollars each....but the problem really lies in that these bulbs put out a ton of heat....ever see a production and the actors are sweating because of the lights.....they get damn hot. There is no way to get rid of that heat effectively.