It is 6 scenes according to this:
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The Dark Knight: The IMAX Experience features six sequences filmed with IMAX® cameras, the first time ever that a major feature film has been even partially shot using IMAX cameras, marking a revolutionary integration of the two film formats. The worldwide premiere of the film will be held at the AMC Loews Lincoln Square 13 with IMAX in New York on July 14th, the first time a Hollywood feature film has premiered in an IMAX theatre.
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