Canon Digital Photography Forums Question about DOF (I think)
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 13th of September 2010 (Mon) #1 Gamb Member   Join Date: Aug 2008 Location: Atlanta,GA Posts: 234 Question about DOF (I think) Went to the beach this past weekend and was fiddling with the camera using my dog as a subject. I was working with my flash b/c the dog and i were in the shade on the deck and the beach and ocean were behind us in the bright sunshine. I was showing some pictures to a buddy of mine today and he commented that in the photo below he thought the palm trees in the background would be in better focus because I was at F/11. Well.. it got me curious also so I thought I'd throw the question out here Why aren't the palm trees and background in better focus at F/11? __________________ Gear
 21st of September 2010 (Tue) #2 canongrip Member     Join Date: Jun 2010 Location: Netherland Posts: 236 Re: Question about DOF (I think) Smaller aperture will giver bigger DOF. But not infinit DOF! The focus point is very close to camera. It's normal that a few meters away, the image will stay out of focus, regardless the aperture number. I suggest that you try the same scenario with different aperture sizes to understand the implicants of DOF with two 'subjects' so far away one from another. __________________ .. known as David Raco (●●)( site) gear list & historic Last edited by canongrip : 21st of September 2010 (Tue) at 11:29.
 21st of September 2010 (Tue) #3 gonzogolf Cream of the Crop   Join Date: Dec 2006 Posts: 19,564 Re: Question about DOF (I think) It comes down to how close you are to the primary subject. Try this DOF calculator. http://www.dofmaster.com/dofjs.html Enter your aperture and lens then play with the distance to subject. At 4 feet (just guessing) your DOF is about 3 feet. If you changed that to 15 feet your DOF goes to infinite.
 21st of September 2010 (Tue) #4 Gamb Member   Join Date: Aug 2008 Location: Atlanta,GA Posts: 234 Re: Question about DOF (I think) Ok. I get it. It's because of how close to the dog I was standing. The patio is small, not much room for me to backup there. Thanks __________________ Gear

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