Nikon D5200 - Manual (Page 81)

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Adjusting Shutter Speed and Aperture
While exposure lock is in effect, the following settings can be adjusted without altering the
metered value for exposure:
Mode Setting
Programmed auto Shutter speed and aperture (flexible program; 0 56)
Shutter-priority auto Shutter speed
Aperture-priority auto Aperture
The metering method itself can not be changed while exposure lock is in effect.