Nikon D300 User Manual page 242

Bracketing overrides Number of shots, so you may not get
what you expected if any kind of bracketing is active.
My Recommendation: Please learn to use this function! It is
complicated, but if you read this section carefully and practice
using Interval timer shooting as you read, you'll learn it
quickly. This type of photography allows you to shoot things
like flowers gradually opening or the sun moving across the
sky. Have some fun with it!
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