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Old 05-04-2007, 05:14 PM   #4
frog
0-60 in 17 seconds (eek)
 
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Some photos of a lens with the iris (diaphragm) open at various apertures...


Iris fully open at f2.


Iris partially closed at f5.6, you can just about make up the blades.


Iris closed further at f11.


Now almost completely closed at f22.
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