httpv://www.youtube.com/watch?v=X7_wL0ZZi6k
Yes, this a video about the creation of video camera lenses, but the same rule applies to your standard high quality Canon or Nikon lens. I had to post it mainly because I just worked 18 hours last night on a commercial, and I found the music and video very hypnotizing.
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[via Gizmodo] (the post on Giz gives further explanation into lens quality as well and is worthy of a read)