Can someone explain the difference to me? Harmy, Zombie?
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35mm film is 35 millimeters wide, 70mm film is 70 millimeters wide. This means that 70mm film has a larger physical area on which to place an image, meaning much greater detail and clarity.
Also, IMAX is just 70mm film turned on its side, making the physical area on which an image can be stored even bigger, resulting in even greater clarity and detail than regular 70mm.
Pretty simple then. Thanks Chainsaw.
“It is only through interaction, through decision and choice, through confrontation, physical or mental, that the Force can grow within you.”
-Kreia, Jedi Master and Sith Lord
Also: 35mm anamorphic is 2.35:1 whereas 70mm is 2.21:1. When 2.35 films like Star Wars were blown up to 70mm print sizes, the edges were slightly cropped but had better image fidelity. Still, it does not match up to a true 70mm shot film. And on Ben-Hur they added an anamorphic lens to the 70mm camera which then squeezed the ratio to an awesomely wide 2.76:1.
Sound-wise, 70mm wasn't limited to mono and stereo optical tracks like 35mm. 70 used a six track stereo magnetic audio system up until the Dolby version which changed two channels into a set of two "baby boom" giant subwoofer units. This was essentially the first LFE channel, and the format became 4.2 sound. This was then refined over time (and carried over into 35mm as a stereo matrixed 4.0) into the now standard 5.1 surround sound that debuted with Dolby's mix on Batman Returns in 1992.
The difference between IMAX and 70mm is very slight. Technically they are different formats, but I think this is only in numbers/measurements/ratios etc. Unfortunately very few theaters exist in the world that can actually present 70mm.
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captainsolo said:
And on Ben-Hur they added an anamorphic lens to the 70mm camera which then squeezed the ratio to an awesomely wide 2.76:1.
Just to clarify, 70mm films are shot in a 65mm format but the extra 5 millimeters are for the magnetic soundtrack.
Just to note, Ben Hur was shot in the 2.76:1 ultra panavision format, but was shown in theatres in 2.5:1 (this also hid soft imperfections on the edges of anamorphic processes. )
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