Yeah, the only real Imax screen I've ever seen was the 20 meter sized one in the Space and Science center. They still do actual Imax film reels but the theater is mainly used for documentaries.The IMAX theater at Henry Ford Museum in Dearborn, MI is closed and will not be an imax screen when it re-opens. This is disappointing because they had the largest IMAX screen in michigan (84' x 62' or 26m x 19m) and ran real 70mm film - two of them for 3D.
One of the local Ann Arbor cinemas had a 70mm projector when it opened (true IMAX vs the newer digital format) but I'm not sure that's the case anymore - When The Force Awakens was shown in true 70mm in 40+ theaters in the US, this one was not listed as one of them. I believe they've switched to the digital format. The digital IMAX format has very few differences from any other digital projection format in most theaters today, IMAX has so diluted its product in order to get its brand into theaters that there's little reason to seek out an IMAX showing vs a regular showing of a movie anymore.
The last movie to play on the Henry Ford Imax in true 70mm 3D was The Polar Express, re-released just last month before closing. Wish I had known it was closing, and that they were showing it again. The blueray doesn't compare to the true IMAX experience.
RIP, IMAX.
The ones in the city that show movies are all the rinky dink barely different from the regular theater Imax.