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Old 01-06-2012, 01:21 PM   #14
Mr. Pick
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Join Date: Nov 2011
Location: Middle Tennessee
Posts: 662
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Interesting that in all the threads about f stops and shutter speeds that no one mentions focal length. Big difference in depth of field between shooting wide angle at say 18mm and shooting telephoto at 200mm. An f5.6 gives you a big depth of field at 18mm but not much at 200mm. You have to factor that in when you decide which f stop will work.

Back in the old days they used to put DOF marks on the lens, now they don't. Learning the varies DOF ranges for some of the common focal lengths you shoot at can help a great deal in determining f stops. Learning the hyper-focal point for various common focal lengths helps too.

Good site here to play around with. There are other sites like this, but I like this one the best.

http://www.dofmaster.com/dofjs.html
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