If you are a true film enthusiast hunting the full 1.43:1 IMAX ratio (the height that IMAX 70mm theaters use), you cannot legally download it. No commercial home release includes the full 1.43 ratio—only the 1.78:1 (16:9) variant.
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Even at a , this IMAX "opening up" effect provides significantly more visual information than standard theatrical versions, making it a preferred choice for fans watching on smaller screens or tablets. Plot and Performance Download - Interstellar.2014.BluRay.IMAX.480p....