The most consequential fact about IMAX 70mm film in 2024 is not its image quality — it's that the format requires a dedicated physical infrastructure that almost no other medium demands. Vaults. Technicians trained to splice reels that stand as tall as a person. A projection booth maintained specifically so directors can review and approve what their film looks like printed on the largest photochemical format commercially available. This is not nostalgia. It is a supply chain.
The Physical Weight of the Format
IMAX 70mm runs film horizontally through the gate, exposing a frame roughly 10 perforations wide — compared to the 4 perforations of standard 35mm. The resulting negative area is approximately 10 times larger than a standard 35mm frame, which is why the format demands its own projection infrastructure rather than simply dropping into existing booths. The reels that emerge from this process are not props. They are industrial objects: heavy, tall, requiring trained hands to splice correctly without introducing artifacts visible on a screen that can exceed 80 feet.
The IMAX Los Angeles headquarters functions as a kind of terminus for this process. Prints arrive from the lab — a process documented in a companion video covering the scanning and printing side — and enter a vault designed to maintain archival conditions. From there, technicians prepare reels for theatrical runs or for the in-house review theater, where directors including Christopher Nolan and Quentin Tarantino have come to verify that what they shot matches what will be projected. The director sign-off is not ceremonial. A 70mm print that leaves the facility carrying a director's approval has been physically inspected, not just digitally compared.
The comparison point here is the DCP — the Digital Cinema Package that now governs virtually all theatrical distribution. A DCP is a hard drive. It ships, it plays, it is replaced. There is no splice, no vault protocol, no reel-by-reel inspection. The operational simplicity of digital distribution is precisely what makes 70mm's persistence remarkable: exhibitors and studios absorb significant cost and complexity to maintain a format that serves a fraction of a percent of global screenings.
Why Directors Still Come to the Booth
The in-house theater at IMAX's LA facility is not a screening room in the conventional sense. It is a calibration environment. When a director sits in that booth or that auditorium, they are checking a physical artifact against a mental image formed during production — often years earlier. The print is the final translation of that image, and film's photochemical rendering of color, grain, and contrast differs from digital in ways that remain difficult to fully characterize but are immediately visible to trained eyes.
This is where the format's cultural weight concentrates. The booth visit is a ritual with real stakes: a print approved here will be projected in a small number of IMAX venues worldwide, seen by audiences who paid a premium specifically for the format. The chain of custody — from camera negative to vault to splice bay to projection booth to screen — is unbroken and physical. Every link is inspectable.
What remains unresolved is the economics. IMAX has not disclosed how many 70mm prints it produces annually, and the number of venues capable of projecting them remains in the dozens globally. The format survives because a handful of directors treat it as non-negotiable and because IMAX has maintained the infrastructure to support them. Whether that infrastructure outlasts the current generation of format advocates is an open question that no amount of archival enthusiasm can answer.
The booth at IMAX's LA headquarters is, in the most literal sense, a room where the past is kept operational. What it cannot do is guarantee its own succession.
Source · The Frontier | Movies
