Canon EOS 77D User Manual - Page 158

g: Setting the ISO Speed for Still PhotosN 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. Regarding the ISO speed during movie shooting, see pages 278 and 281. 1 Press the button (9). 2 Set the ISO speed.  While looking at the LCD panel or in the viewfinder, turn the or dial.  ISO speed can be set within ISO 100 ISO 25600.  "A" indicates ISO Auto. The ISO speed will be set automatically (p.159).  When the screen shown on the left is displayed, you can press the button to set it to "AUTO". ISO Speed Guide ISO Speed Shooting Situation (No flash) ISO 100 - ISO 400 Sunny outdoors ISO 400 - ISO 1600 Overcast skies or evening time ISO 1600 - ISO 25600, H Dark indoors or night * High ISO speeds will result in grainier images. Flash Range The higher the ISO speed, the farther the effective flash range will be (p.216).  You can also set with [z2: zISO speed].  Under [54: Custom Functions (C.Fn)], if [2: ISO expansion] is set to [1:On], "H" (equivalent to ISO 51200) can also be selected (p.402). 158