The Digital Revolution Podcast "Episode 5: Lenses":

This week Dakota Wolff Nicolucci and myself talk about the infinite options that are available to us when deciding what type of lenses to purchase for our DSLR's. We bring to awareness that there are different lenses for a cropped sensor (Canon 7D 1.6x) compared to a full frame sensor (Canon 5D mkii). The difference between shooting with a variable millimeter lens often referred to as a "Zoom Lens," rather than shooting with primes, depends on what your production caters to. Finally we discuss dusting off your old lenses and buying an adapter in order to use with the DSLR's.