Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 172
from selecting L equivalent to ISO 50, ISO 100/125/160, H1, H2, or H3
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Caution Image noise (dots of light or banding) and irregular colors may increase and apparent resolution may decrease at H1, H2, or H3 (equivalent to ISO 204800, 409600, and 819200, respectively), because these are expanded ISO speeds. Because L (equivalent to ISO 50) is an expanded ISO speed setting, the dynamic range will be somewhat narrower compared to the standard setting. Setting the ISO speed to L (equivalent to ISO 50) may result in loss of gradation in highlights of your shots, even if gradation is visible in Live View image highlights. Setting [ : Highlight tone priority] to [Enable] [Enhanced] ( ) will prevent you from selecting L (equivalent to ISO 50), ISO 100/125/160, H1, H2, or H3 (equivalent to ISO 204800, 409600, and 819200, respectively). When shooting with a high ISO speed, high temperature, long exposure, or multiple exposure, image noise (graininess, dots of light, banding, etc.), irregular colors, or color shift may become noticeable. 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. If you use a high ISO speed and flash to shoot a close subject, overexposure may result. Note Low ISO speeds reduce image noise but may increase the risk of camera/subject shake or reduce the area in focus (shallower depth of field), in some shooting conditions. High ISO speeds enable low-light shooting, a larger area in focus (deeper depth of field), and longer flash range but may increase image noise. Can also be set on the [ISO speed] screen in [ : ISO speed settings]. Shutter sounds after the camera shoots may vary depending on the ISO speed setting. 172