Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 215)

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ISO Speed Settings for Still Photos
ISO Speed Range When Set Manually
1 Select [ z : z ISO speed settings].
2 Select [ISO speed range].
3 Set the minimum limit.

Select the minimum limit box, then press
<
0
>.

Select the ISO speed, then press <
0
>.
4 Set the maximum limit.

Select the maximum limit box, then
press <
0
>.

Select the ISO speed, then press <
0
>.
5 Select [OK].