Check out the Vimeo Video School Series here-
vimeo.com/videoschool/lesson/113/behind-the-glass-focal-length

Part 1: An Introduction to Lenses - vimeo.com/27582408
Part 3: Depth of Field - vimeo.com/27556482

Music by digi g'alessio used under Creative Commons:
soundcloud.com/digigalessio/morning-jam-with-darth-vader

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