Behind the Glass Part 2: Focal Length
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