IMAX cinema- Physics behind it

[acidvoodoo]

so currently i'm writing a report on imax cinema. My main focus is on how it uses polarization to display the images, and i have to write about lens formula.

i found an article on howstuffworks.com , but am having trouble finding any other detailed resources [my google searches keep showing up stuff on movie listings]

sorry if this is incoherent

-acidvoodoo

 

900 words is nothing. http://www.imax.com and you're done. Don't whine.

 

[agnitrate]

900 words? That's like a page and a half. There's got to be tons of info out there somewhere.

-silver

 

[Bootprint]

Are you talking about regular IMAX, or IMAX 3D?

 

[acidvoodoo]

Originally posted by: Bootprint
Are you talking about regular IMAX, or IMAX 3D?

ya see, i'm not really sure. We went to watch a 3d film first, then went to the control room thing [well, outside it] , and were told some things about the 2 projectors and stuff. i think it's 3d imax

 

[kami333]

You must suck at googling, I turned up a bunch of hits easily.

hint: search for: imax technology

 

[acidvoodoo]

Originally posted by: kami333
You must suck at googling, I turned up a bunch of hits easily.

hint: search for: imax technology

you rule



yea i do suck at googling i was searching 'imax how it works' and crap

 

Doesn't Google exclude common words like "how" and "it?" Yup, you do suck. Don't ever become a librarian.

 

[Bootprint]

Originally posted by: acidvoodoo

Originally posted by: Bootprint
Are you talking about regular IMAX, or IMAX 3D?

ya see, i'm not really sure. We went to watch a 3d film first, then went to the control room thing [well, outside it] , and were told some things about the 2 projectors and stuff. i think it's 3d imax

Sounds like 3d IMAX, regular IMAX is just a big ass film. 3d IMAX is big ass film, where you wear the electronic shutter glasses for the 3d effect.

One, link

 

[silverpig]

It would have to be 3d. Here's the gist of it:

There are two reels of film. Light is shone through each reel, with only one frame between the reels being illuminated at once.

Frame 1 - right reel
Frame 2 - left reel
Frame 3 - right reel
etc...

The light from the right reel shines through a polarizer which makes all of the light oriented in one way (a google on polarized light will tell you more about this). The same happens for the left reel, but the polarization angle is 90 degrees to the polarizer on the right reel. The light hits the screen and bounces towards your eyes. Each of the lenses in the 3d glasses is polarized in such a way as to let in all the light from one of the reels, but block almost all the light from the other. One eye sees one image, the other sees another image.

If you put on two pairs of 3d glasses in normal light it will look the same as if you had one pair on... maybe a little dimmer. But if you put one pair on, and then held the other pair up so that the right lens was over your left eye and the left was over your right, then you wouldn't be able to see much, if anything as the crossed polarizers block virtually all the light coming through. Twisting the second pair at other angles will give varying degrees of blockage.

 

[acidvoodoo]

Originally posted by: jumpr
Doesn't Google exclude common words like "how" and "it?" Yup, you do suck. Don't ever become a librarian.

don't think i'd wanna limit myself there

thus why i take physics :S

 

[acidvoodoo]

Originally posted by: silverpig
It would have to be 3d. Here's the gist of it:

There are two reels of film. Light is shone through each reel, with only one frame between the reels being illuminated at once.

Frame 1 - right reel
Frame 2 - left reel
Frame 3 - right reel
etc...

The light from the right reel shines through a polarizer which makes all of the light oriented in one way (a google on polarized light will tell you more about this). The same happens for the left reel, but the polarization angle is 90 degrees to the polarizer on the right reel. The light hits the screen and bounces towards your eyes. Each of the lenses in the 3d glasses is polarized in such a way as to let in all the light from one of the reels, but block almost all the light from the other. One eye sees one image, the other sees another image.

If you put on two pairs of 3d glasses in normal light it will look the same as if you had one pair on... maybe a little dimmer. But if you put one pair on, and then held the other pair up so that the right lens was over your left eye and the left was over your right, then you wouldn't be able to see much, if anything as the crossed polarizers block virtually all the light coming through. Twisting the second pair at other angles will give varying degrees of blockage.

thanks so much man. i understood polarization, but not how the glasses and projectors worked together

-acid

 

[Ness]

rought outline:

-What is imax (a summary)
-From start to finish:
--Filming
---lenses
---techniques
---differences between imax filming and regular filming
--post processesing
---any differences in editing/post processesing imax film?
--Presentation
---how is the film run
---the theater environment
---specs about screens/sound systems
--Conclusion
---Summarize the processes
---Your Imax experience
---Closing Comments


If you can't get at least 1500 words out of that, you suck.

 

[acidvoodoo]

ok i just realised that the theatre i went to didn't use these fancy machanical headsets, they were just orange things with 2 big lenses. however, we were assuered they weren't the oldskool red and green things, but that they polarized the light differently for each lens. does the one-lens-one-image at a time thing still apply?

 

[virtueixi]

Originally posted by: Ness
rought outline:

-What is imax (a summary)
-From start to finish:
--Filming
---lenses
---techniques
---differences between imax filming and regular filming
--post processesing
---any differences in editing/post processesing imax film?
--Presentation
---how is the film run
---the theater environment
---specs about screens/sound systems
--Conclusion
---Summarize the processes
---Your Imax experience
---Closing Comments


If you can't get at least 1500 words out of that, you suck.

I agree, you do suck, expecially if you can't write a 2 page paper.

 

[acidvoodoo]

Originally posted by: Ness
rought outline:

-What is imax (a summary)
-From start to finish:
--Filming
---lenses
---techniques
---differences between imax filming and regular filming
--post processesing
---any differences in editing/post processesing imax film?
--Presentation
---how is the film run
---the theater environment
---specs about screens/sound systems
--Conclusion
---Summarize the processes
---Your Imax experience
---Closing Comments


If you can't get at least 1500 words out of that, you suck.

no no, we're only writing about the lenses and projector type stuff, not how the whole thing works [i could go on about the sonud system and computers etc if that were the case ]

thats for the post anyway

i'm up to 500

 

[Ness]

And? That's still important information. Not only does it help put things in perspective as to WHAT they do, but it tell how everything is done.

Just get rid of the part about sound systems, and the thing still stands.

What's the point in telling how something works if you don't tell the effects?

 

[acidvoodoo]

Originally posted by: Ness
And? That's still important information. Not only does it help put things in perspective as to WHAT they do, but it tell how everything is done.

Just get rid of the part about sound systems, and the thing still stands.

What's the point in telling how something works if you don't tell the effects?

ok ill add abit in to jack up my workcount