Canon EOS Rebel T4i 18-135mm IS STM Lens Kit Instruction Manual - Page 90

i: Changing the ISO SpeedN Set the ISO speed (image sensor's sensitivity to light) to suit the ambient light level. In Basic Zone modes, the ISO speed is set automatically (p.91). 1 Press the button. (9) X [ISO speed] will appear. 2 Set the ISO speed. Press the key or turn the dial to select the desired ISO speed, then press . You can also set the ISO speed in the viewfinder while turning the dial. With [AUTO] selected, the ISO speed will be set automatically (p.91). ISO Speed Guide ISO Speed Shooting Situation (No flash) Flash Range 100 - 400 400 - 1600 1600 - 12800, H Sunny outdoors The higher the ISO speed, Overcast skies or evening time the farther the flash range Dark indoors or night will extend (p.104). * High ISO speeds will result in grainier images. Under [54: Custom Functions (C.Fn)], if [2: ISO expansion] is set to [1: On], "H" (equivalent to ISO 25600) can also be set (p.294). Under [54: Custom Functions (C.Fn)], if [3: Highlight tone priority] is set to [1: Enable], ISO 100 and "H" (equivalent to ISO 25600) cannot be selected (p.295). Shooting in high temperatures may result in images that look grainier. Long exposures can also cause irregular colors in the image. 90