Nikon D5500 - Manual (Page 84)

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A
NEF (RAW)
NEF (RAW) recording is not available in %, S, T, U, ', (, and 3 modes.
Pictures taken when an NEF (RAW) or NEF (RAW)+JPEG option is
selected in these modes will be recorded as JPEG images. JPEG images
created at settings of NEF (RAW)+JPEG will be recorded at the selected
JPEG quality, while images recorded at a setting of NEF (RAW) will be
recorded as fine-quality images.
A U and ( Modes
Autofocus is not available during movie recording. The live view
refresh rate will drop, together with the frame rate for continuous
release modes; using autofocus during live view photography will
disrupt the preview.
A
Preventing Blur
Use a tripod to prevent blur caused by camera shake at slow shutter
speeds.