KirkS518 Goldmember  3,983 posts Likes: 24 Joined Apr 2012 Location: Central Gulf Coast, Flori-duh More info | Jul 15, 2012 06:33 | #1 In another thread, someone used the example of a 100mm lens at f2, and that the aperture opening is 50mm (100mm/2). Is that how it works? I've never cared about the actual aperture size, so never gave it any thought. If this is correct, then the opening at f22 on the same lens would be (100mm/22) 4.5454mm? Interesting. If steroids are illegal for athletes, should PS be illegal for models?
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EchoJohnson Senior Member  433 posts Joined Aug 2011 Location: UK More info | Jul 15, 2012 07:09 | #2 Correct. Canon 5D3 | 17-40 | 50/1.4 | 135/2
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