Canon EOS Rebel T6i EF-S 18-55mm IS STM Lens Kit Instruction Manual - Page 123
Setting the Maximum ISO Speed for, ISO Auto
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g: Changing the ISO Speed to Suit the LightK When you shoot at high ISO speeds, noise (such as dots of light and banding) may become noticeable. If you use a high ISO speed and flash to shoot a close subject, overexposure may result. When shooting in conditions that produce an extreme amount of noise, such as a combination of high ISO speed, high temperature and long exposure, images may not be recorded properly. As "H" (equivalent to ISO 25600) is an expanded ISO speed setting, noise (such as dots of light and banding) and irregular colors will be more noticeable, and the resolution will be lower than usual. As the maximum ISO speed that can be set differs between still photo shooting and movie shooting (manual exposure), the ISO speed you set may change when you switch from still photo shooting to movie shooting. Even if you switch back to still photo shooting, the ISO speed will not revert to the original setting. The maximum ISO speed that can be set varies depending on the setting for [2: ISO expansion] under [54: Custom Functions (C.Fn)]. • When [0: Off] is set: If you set ISO 12800 during still photo shooting and then switch to movie shooting, ISO speed will be changed to ISO 6400. • When [1: On] is set: If you set ISO 12800 or "H" (equivalent to ISO 25600) during still photo shooting and then switch to movie shooting, ISO speed will be changed to "H" (equivalent to ISO 12800). 3 Setting the Maximum ISO Speed for [AUTO]K For ISO Auto, you can set the maximum ISO speed limit within ISO 400 - ISO 6400. Under the [z3] tab, select [ISO Auto], then press . Select the ISO speed, then press . 123