FujiFilm X-T20 - Manual (Page 85)

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ing Phot
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Choosing a Shooting Mode
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At settings other than 180X, shutter speed can also be
adjusted in increments of 1⁄3 EV by rotating the rear com-
mand dial. Shutter speed can be adjusted even while the
shutter button is pressed halfway.
Sensitivity and Depth of Field
If you choose a fast shutter speed when the subject is poorly
lit, the camera autoexposure program will select a wider ap-
erture. This will produce the correct exposure but may also
reduce depth of fi eld so that less of the area behind and in
front of your subject appears to be in focus. To stop aperture
down and increase depth of fi eld, select a higher sensitivity.