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Authentically Simulating Sunlight Through a Window (1 reply and 2 comments)

bcmatt
1 month ago
bcmatt 1 month ago

I just watched this DIY video where he comes up with some neat ideas to simulate the parallel rays of sunlight that

a) doesn't change the size of shadows based on distance from the surface being cast on

b) doesn't create chromatic aberrations when focusing the light rays to parallel

c) looks more orange when in direct focus but scattering more blue (like the sky does) when indirect (this is the most unique part of his solution in my opinion where he makes a window with soapy water in it to scatter the light authentically like Earth's atmosphere does) He actually tries to deal with the Rayleigh Scattering and the Tyndall Effect.

d) and obviously has a high CRI value and appropriate colour temperature.

 

Anyways, here is his video:
https://youtu.be/6bqBsHSwPgw»

I know film-makers are often trying to simulate the sun due to shoot schedules and locations not always cooperating and while they consider the small distant source of the sun, I wondered if there is ever an attempt to tackle Rayleigh Scattering and the Tyndall Effect.

Personally, I'm fine to "wait for the light", but just wondering about those sorts of productions that need to blast their own lights through windows, and whether they would try making their own water-tight double-pane windows... or if they have other solutions they use.... or if that sort of realism is even much of a priority.

Mike
1 month ago
Mike 1 month ago

There was a detailed discussion about this only 3 months ago.

Very nice idea but the cost and the time searching for parts was prohibitive. A second hand Arri light with bulb could be bought for the same price. Goods points are its compact size and easy storage. 
Bad points is the Initial cost of the special Chinese bulb which is sold with no guarantees or sales backup.

bcmatt
1 month ago

Oh, sorry, I was looking through older posts but must have missed it.
I know there are better solutions for the light itself that are probably worth the money.
I'm more curious if there has been an attempt to match the Rayleigh Scattering and the Tyndall Effect like he does with the soapy water in the glass:
https://youtu.be/6bqBsHSwPgw?t=773»

Mike
1 month ago

Why don’t you have a go at building one and let us know if it was cost effective that way you can then suggest if it can be improved. A lot of people are interested in this design and the video demonstrates that it works but for how long!

If you can buy the bulb cheaper then it would create more interest but when the bulb alone costs $500.00 on its own then it’s a non starter. It burns white hot, you then need a water pump, water cooling to stop it from blowing up or melting and combining this lot with mains voltage you then have health and safety issues.

Ideal rig if you want to top up your sun tan but ‘frying’ an actors face will involved expensive litigation sooner or later. Not a route I wish take. Invest you money in a ‘pre loved’ Arri 12K.

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