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Tv or Av or P or CA or Full Auto: The camera will automatically set the ISO speed at 400 (or 800 on Rebel T 3). Av Fill-in Flash: If the pre-flash detects overexposure at ISO 400 (or 800), the camera will reduce the ISO to as low as 100. P or CA or Full Auto & bounce flash: If the preflash detects under-exposure at ISO 400 (or 800), the camera will increase the ISO speed to as high as 1600.
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