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70mm
70mm is the largest standard exhibition film gauge.
- aspect ratios
- Magnetic sound and noise reduction
- DTS discs
- handling of mag prints/degaussing
IMAX
IMAX is a 70mm film format on which the image is printed horizontally, resulting in a much larger filmed image than conventional 70mm. It's often referred to as 15/70, 15 being the number of perforations in a single frame.
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A frame of IMAX film.
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5 perf 70mm
Related Articles
Resources
Images of Various Aspect Ratios and Sound Formats, 5/70mm
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Frames from a 70mm print of Aliens. Blow-up from 35mm, aspect ratio 1.85:1, magnetic audio track.
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Frames from a 70mm print of It's a Mad, Mad, Mad, Mad World. Aspect ratio is 2.76:1 (Ultra Panavision) with a DTS audio track.
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Frames from a 70mm print of 2001:A Space Odyssey. Aspect ratio 2.2:1 with magnetic audio track
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Alignment chart from a 70mm print of Inherent Vice. Blow-up from 35mm, aspect ratio 1.85:1
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Inspecting a 70mm print of West Side Story. Aspect ratio 2.2:1, DTS audio track
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Boston Light and Sound 5/70 test film on screen
