Hi,
I was explaining to a friend a few things about how the DIY PJ works, and he got me thinking why we don't usually see multiple (non-LED) light sources. I set him off right away about the heat too high and stuff, but he got me wondering if properly done it could help the brightness and evenness(sp?) of the projection.
First idea: it was to use a multi-fresnel setup instead of the first fresnel. Something like a four center's of separate fresnels, one in each quadrant of the new fresnel. And of course a light aligned with each one of the fresnels. And the rest of the project could remain the same. Perhaps we would have to use 150 W lamps or less, and say we sort that and the heat problem out, would it work?
The only problem I see is a big, cross-like seem in the middle of the image, but that I think could be solved by heat-glueing the fresnels or something like that.
Second idea: joining the light of two or three lamps in a prism, like the commercial projectors do with the 3 lcds. I guess they are expensive since I haven't seen none in a DIY PJ. But they wouldn't need the full quality since it's only bent light, not image, like the fresnels. I'm not sure, but I think I saw a few posts about making prism lenses for 2.35:1 somewhere, so I guess it could be DIY. Then of course the first fresnel would focus this light to the lcd and the rest of the PJ remains as is.
These ideas might sound stupid, but I currently can't see why it wouldn't work, that's why I'm asking here in the first place: to differ where it is a impossible or just not worth it, or perhaps worth a try.
Well that's it.
Regards
I was explaining to a friend a few things about how the DIY PJ works, and he got me thinking why we don't usually see multiple (non-LED) light sources. I set him off right away about the heat too high and stuff, but he got me wondering if properly done it could help the brightness and evenness(sp?) of the projection.
First idea: it was to use a multi-fresnel setup instead of the first fresnel. Something like a four center's of separate fresnels, one in each quadrant of the new fresnel. And of course a light aligned with each one of the fresnels. And the rest of the project could remain the same. Perhaps we would have to use 150 W lamps or less, and say we sort that and the heat problem out, would it work?
The only problem I see is a big, cross-like seem in the middle of the image, but that I think could be solved by heat-glueing the fresnels or something like that.
Second idea: joining the light of two or three lamps in a prism, like the commercial projectors do with the 3 lcds. I guess they are expensive since I haven't seen none in a DIY PJ. But they wouldn't need the full quality since it's only bent light, not image, like the fresnels. I'm not sure, but I think I saw a few posts about making prism lenses for 2.35:1 somewhere, so I guess it could be DIY. Then of course the first fresnel would focus this light to the lcd and the rest of the PJ remains as is.
These ideas might sound stupid, but I currently can't see why it wouldn't work, that's why I'm asking here in the first place: to differ where it is a impossible or just not worth it, or perhaps worth a try.
Well that's it.
Regards
That sounds awesome. I will have a spare fresnel-pair (heat deformed it, and I tried to compesate with heat on the other side -> BAD IDEA, it deformed too much) that i could use to make some tests on your idea, if noone prove your idea impossible.
Maybe a test with regular bulbs can tell if it would work, so I don't spend even more money.
But thanks for sharing the idea, hope you do try that, as everyone else, maybe we can come up with a new light setup thats more efficient.
Thanks slappy, and more ideas people!
Maybe a test with regular bulbs can tell if it would work, so I don't spend even more money.
But thanks for sharing the idea, hope you do try that, as everyone else, maybe we can come up with a new light setup thats more efficient.
Thanks slappy, and more ideas people!
warlockxkz
Your first thought with maybe 2 fresnels connected/cut to size with 2x lamp could work, perhaps 2x 150 or 2x 250.
slappy76
This looks possible to me as well just needs to be tried.
The trouble with DIY is we are all poor...we dont have the money to buy extra, therefore we all want to rely on someone else to prove the theory, unforunately that applies to me as well.
But saying that the thought of even brightness 'a better picture' is an idea to hold if we are not happy with our proj, and will probably push us to try things.
Anything that gets us closer to the commercial brightness has got my support.
Your first thought with maybe 2 fresnels connected/cut to size with 2x lamp could work, perhaps 2x 150 or 2x 250.
slappy76
This looks possible to me as well just needs to be tried.
The trouble with DIY is we are all poor...we dont have the money to buy extra, therefore we all want to rely on someone else to prove the theory, unforunately that applies to me as well.
But saying that the thought of even brightness 'a better picture' is an idea to hold if we are not happy with our proj, and will probably push us to try things.
Anything that gets us closer to the commercial brightness has got my support.
I might be able to test the 2 back-fresnel setup, but I won´t cut them yet for now, I would like to try a few designs before doing that. So maybe i will do a partial test to see if I can get anything from it. But I still have to wait my new fresnels get here so I can move on on the tests.
Come on people, more ideas, and people with spare fresnels and lamps could be of much help to test these ideas.
Come on people, more ideas, and people with spare fresnels and lamps could be of much help to test these ideas.
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