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Old Sep 10, 2009, 10:58 AM   #15
Join Date: Aug 2004
Posts: 8,529

The term "buttery" is used to refer to smooth background (like melted butter) as opposed to jagged background. TCAV already provided a link showing the donut affect. It should also be noted that how the 'bokeh' looks is affected by what is in the background. It's easier to end up with a smooth looking bokeh when the background is uniform. Like this:

Same camera and lens - not as tightly framed (so greater DOF) combined with leaves in the background which don't blur as nicely and you get:

Not bad, but not as pleasing. My point in posting both is that bokeh isn't simply a matter of the lens. It's a matter of DOF, distance from your subject to background and what that background is.

Last edited by JohnG; Sep 10, 2009 at 11:01 AM.
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