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This topic comprises 2 pages: 1 2
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Author
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Topic: Laser light source for 35mm projector?
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Marcel Birgelen
Film God
Posts: 3357
From: Maastricht, Limburg, Netherlands
Registered: Feb 2012
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posted 09-04-2019 07:49 AM
Personally, I don't see light sources as the biggest challenge to continue film presentation in the future.
There were millions of cars sold with xenon lights in them, they'll be around for a while in one form or another.
Laser right now is an up and coming technology for high-powered light sources, some deluxe car models are currently fitted with laser light, but it's still horrendously expensive. Costs for this will come down and if the supply of carbon arcs and xenons run dry, there will be other powerful light sources that can be adapted to take its place.
Nobody can give you any exact predictions about the market for light sources between now and 20 years in the future.
There is a bigger challenge in keeping film alive than light sources and that's the film stock itself. Once the demand drops below a certain level, it's no longer profitable for whatever remains of Kodak to make it, the supply is in great danger. Also, it's clear that making film stock requires a skill-set and machinery, not easily duplicated, otherwise, there would be multiple shops in Shenzen doing it...
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Carsten Kurz
Film God
Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009
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posted 09-07-2019 07:45 AM
Many cinemas still have boxes of carbons stored, and you can still buy them frequently on ebay. Given that cinemas stopped using carbon in the seventies, we can still buy them now, nearly fifty years later. Not for a daily operation, but who does play carbon as a daily operation? So, for how long will there be Xenon bulbs available, given that they are still manufactured in high quantity today, and played/used as infrequently? There simply is no incentive to develop a laser light source for film. LED for special applications, yes, that is much easier to start with.
- Carsten
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Marcel Birgelen
Film God
Posts: 3357
From: Maastricht, Limburg, Netherlands
Registered: Feb 2012
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posted 09-10-2019 07:33 PM
I don't think that LED will scale for anything other than 8 or 16mm, without some serious R&D. For 35mm, you need some professional optics, which cost a lot of money to make, at least that was our conclusion after we tried this ourselves a few years back. Although LED intensities have only improved since then, I still think you won't escape to combine multiple light sources if you try to light up 35mm on anything other than a tiny screen. Combining multiple light sources and focusing them correctly isn't impossible, but it's more than just a Saturday afternoon hobby project, it will require some custom optics that need to be measured, calculated and produced.
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