----- Original Message ----- From: "Paul Stenquist" Subject: Re: another lens specific focus adjustment
>I find the out-of-focus rendering to be just fine. In most cases, > bokeh is a function of what's back there rather than how the lens > renders it. Yet both bad and good bokeh are most often considered a > function of the lens, when in truth they're a function of the > brightness and variation of the scene itself. Some examples of > DA50-200 bokeh: Bokeh is helped along greatly by having lots of aperture blades. It's one of the reasons why the Limiteds (and Voigtlanders, from what I've seen) have such nice bokeh. They have nine blade apertures. Any lens should have good bokeh wide open, since the entrance pupil is round. Some of the 5 blade lenses can get pretty scary a few stops down from wide open. If I am not mistaken, lenses with a bit of spherical aberation do better than lenses where it is better corrected also. A lens with good bokeh will make a bad background look at least OK, a lens with bad bokeh won't. I'll take the former over the latter any day, since it allows me to be a bit lazier about what is in an out of focus background. William Robb -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
