Nikon D5500 Reference Manual page 160

2
Choose an option.
Highlight v Auto, 2 Extra high,
S High, T Normal, U Low, or
6 Off and press J.
When an option other than 6 Off is
selected, u will be displayed in the
viewfinder.
3
Frame a photograph, focus, and shoot.
The camera takes two exposures
when the shutter-release button is
pressed all the way down. "l u"
will flash in the viewfinder while the images are combined; no
photographs can be taken until recording is complete. HDR
turns off automatically after the photograph is taken; to turn
off HDR before shooting, rotate the mode dial to a setting
other than P, S, A, or M.
D
Framing HDR Photographs
The edges of the image may be cropped out. The desired results may
not be achieved if the camera or subject moves during shooting. Use
of a tripod is recommended. Depending on the scene, the effect may
not be visible, shadows may appear around bright objects, or halos
may appear around dark objects. Uneven shading may be visible with
some subjects.
136 P, S, A, and M Modes