3D is when you are required to wear the glasses to see the images that will appear to be in 3D, meaning that projection of the images appear to move toward or away from you.
IMAX simply has a way better resolution than a normal theater movie thus it can be played in a way bigger screen and the audio is usually superb as well.
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If you mean red-and-blue vs the new clear glasses, the clear glasses don't totally suck in picture quality. But, if you mean the CLEAR vs IMAX.... (cough)
In theaters and IMAX in Disney digital 3D and IMAX 3D
Yes, in fact Alien in the deep was shot in IMAX 3D format.
The cost for an iMax 3D ticket will vary from city to city. The average cost hovers between $12 and $15. The larger the venue, the higher the price tends to be overall.
1) They are owned by different companies. Real3D is a company unto itself; Imax 3D is of course owned by Imax. Real3D can be retrofitted to any modern theatre; Imax 3D as far as I know is only meant to be used in Imax theatres. 2) They use a slightly different technique to achieve the 3D effect. Both use differential polarization: they show two pictures on top of each other, each one represents one "eye". The 3D glasses lenses are polarized differently, so the right lense filters out the left picture, and the left lens filters the right picture. However, the polarization technique itself is different. I believe that Imax 3D uses what is called "rotational polarization" whereas Real3D uses something else. 3) From experience, I find Real3D to result in better colour and crisper images, but not as much depth as Imax 3D. Imax 3D sometimes has overlapped images, but of course it must work in a much bigger theatre.
James Cameron's Avatar is currently out in 2D, 3D and IMAX 3D formats.