70mm negative width with 10× larger frame than 35mm — extraordinary resolution, brilliance, and color saturation. Prohibitively expensive but visually unmatched for giant screens.
Those who shoot 70mm IMAX work with a medium that pushes the boundaries of what cinema can achieve. The negative is ten times larger than 35mm — we're talking about an image width of 70 millimeters with horizontal transport through the camera. This raw size means: extreme resolution, color depths you won't see anywhere else, and a graininess that only becomes visible with extreme zoom. On set, you work with cameras that are massive, loud, and whose magazines empty quickly — a 65mm IMAX camera typically loads only five to six minutes of footage. Every second of film costs accordingly.
The crucial point: 70mm IMAX is only worthwhile in large-format cinema releases. Those who choose the format consciously decide that the film will run exclusively in specialized venues — IMAX theaters with correspondingly large screens (up to 20 × 26 meters). Christopher Nolan has understood this and has been deliberately using 70mm IMAX for individual sequences for years to achieve maximum visual authority. The camera runs at a constant speed during these takes because any unevenness immediately becomes visible in this format. A camera assistant must work with absolute precision here — any blur is not an "artistic decision" but a mistake.
Editing becomes complicated: the material must be output on special DCP systems, not on standard 4K editors. Color grading on small monitors is useless — you need access to 70mm screenings to truly see how the images look. And archiving is expensive. Filmmakers who use 70mm do so out of a clear visual necessity, not out of nostalgia. It is the last analog large format in mainstream cinema, and it demands respect for its materiality and its limitations.