A picture is always better than a long explanation. It is not so easy to describe the sequence of operations followed by a reflex during shutting. What happen between mirror, shutter, first curtain, second curtain … Marianne and Jeffrey Friedl Oelund had the great idea of filming the shutter of an opened Nikon D3, which allows us to see all the sequences from the inside.
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See the shutter of a DSLR from the inside.