Christopher Nolan’s The Odyssey in Imax 70mm is the hottest club in town, if you can get in. While Nolan’s adaptation of Homer’s epic is available on thousands of screens around the world, there are only 41—including 25 in the US—that can offer it in full Imax 70mm glory. Many of those are sold out for weeks.

Levels of FOMO are off the charts. That’s partly because The Odyssey is the first feature film shot entirely on Imax film with Imax cameras. For the uninitiated, the Imax film format takes an already large 65-mm film negative and runs it through the camera horizontally, resulting in an image 15 perforations wide compared to the standard 5 perf.

When projected on a giant Imax screen, the resulting image, with a squarish aspect ratio of 1.43:1, is enormous and incredibly sharp, creating a far more immersive experience than standard cinema offerings. This is real Imax, according to fans of the format, which was first introduced in 1970. Imax, though, comes in a variety of flavors: digital formats in 2K and 4K resolutions, xenon and laser light configurations, on top of the classic 15/70-mm.

Outside of a select few, most digital Imax theaters crop the image to a wider 1.90:1 aspect ratio and project on screens a good deal smaller than a traditional Imax giant theater. “This all started in 2008 when Imax introduced its first digital system,” says James Hyder, who managed the Smithsonian Air and Space Museum’s Langley Imax theater in the ’80s, and ran the giant-screen industry journal LF Examiner from 2008 to 2021. Imax did not respond to requests for comment.

The company’s foray into digital exhibition with a 2K-resolution dual-projector system was part of a long-planned shift. Executives wanted to expand beyond museums and science centers and into big theater chains, which didn’t always have the screen real estate the traditional Imax experience demands. The result, though, has been notably different Imax experiences depending on what type of Imax theater you’re in.

Especially as major theater chains have invested in PLF (Premium Large Format) screens that rely on Dolby Vision or other systems, it’s hard to know what you’re going to get, or if Imax is even your best bet. Complicating things further for The Odyssey is that it’s available in so many premium formats—six, altogether—that the film’s official website includes a guide to their various strengths and aspect ratios. While it disambiguates between 70mm Imax and “regular” Imax, it doesn’t capture the wide range of what those “regular” experiences can entail.

“It's a disservice to their customers, and it's basically trading on a reputation for real giant screens that used to be what Imax stood for,” Hyder says of the lack of clarity and consistency around how Imax is implemented. Recent years have seen a resurgence in shooting and projecting on film, with Imax 70mm in particular becoming the gold standard. Nolan’s films regularly get Imax 70mm releases on the few screens that can accommodate it, but following the success of Oppenheimer, a string of releases, including Dune: Part Two, Sinners, One Battle After Another, and Project Hail Mary, have followed suit.