f3.5 or f5.6 should give you a reasonably out of focus background if you can get closer to your subject, or get the subject closer to you and ensure that the background is further back.
If your lens is 35-80mm, f3.5 - f5.6 it will be f3.5 at 35mm then moving to f5.6 at 80mm. So, f5.6 is the widest aperture you can get at 80mm, but this should be ok for a nice sharp subject and an out of focus background. You probably wont need to go to f2.8 or wider to get an out of focus background for a portrait type shot.
-------------------- Alan's defence lawyer claimed that "Booze played no part in his typo's."
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Re: Better DOF or die trying...
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