Hate to bug the experts, but I know you guys read this forum ... so ... I wanted to buy glasses for the new hobbit movie, but i got confused. Since I worked on 3D optics over 30 years ago, I figured if i'm confused a lot of other people are confused. Here's my list of basic questions:
Q. What is the optical difference between the IMAX3D glasses and realD 3D glasses?
A. RealD uses circular polarization while IMAX uses linear. This means if the glasses in IMAX theaters are more sensitive to being tilted/not exactly straight on your nose. So if you where glasses, make sure the lenses are completely flat on your bridge or you will see double image. Also means that the lenses are completely different and are not interchangeable between theaters types. There is also cross talk on circular polarization, but you can't do anything about that as a movie goer.
Q. Are realD 3D glasses the ones you need to get to watch 3D in the theater if your not in a IMAX 3D theater?
A. yes ... realD for "normal" 3D (aside from a small set of theaters that are dolby 3d, but you didn't ask about that).
Q. Is HFR 3D (48 fps) only in the "normal" realD 3D theater rooms?
A. No, both imax and realD have both 24 and 48 fps modes.
Q. I don't need different glasses for HFR, right ? (i.e. all i need is either a IMAX 3D or realD glasses)
A. Yes, neither lenses are "active" so frame rate doesn't matter on the glasses that you use in the theaters (though it does for home theater).
Q. Is HFR realD ever shown inside a "imax" theater room? (sometimes i see a movie in a IMAX room, but it is low quality like a normal film)
A. Very rarely.
Q. IMAX 3D is not shown at 48 fps (i need to go to a realD smaller room to see 48 fps)?
A. IMAX 3D HFR is supported at some theaters for the hobbit, though many will show at 24 fps, you need to check internet listing or ask at the theater.
I checked out a bunch of sites, i couldn't find any "practical" information that explains exactly what someone needs to buy for optimized HFR viewing. Much thanks for the answers :)
[Edit ... adding answers, if is a "better" answer, please comment]