Purple fringing and chromatic aberration seem to be separate issues to some degree. And purple fringing is common to digital sensors. But some lenses obviously exacerbate the problem, while others minimize it. Most extreme high contrast situations, like tree banches against a white sky, can invoke it. Paul -------------- Original message ---------------------- From: [EMAIL PROTECTED] > I thought purple fringing - understood as Chromatic Aberration is a lens > issue - caused by the fact, that different coloured light act differently > when passing through glas: > > http://en.wikipedia.org/wiki/Chromatic_aberration > > Regards > Jens > > > > I thought purple fringing was a sensor, not lens issue. ??? > > > > JC OCONNELL > > [EMAIL PROTECTED] > > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of > > William Robb > > Sent: Sunday, July 13, 2008 2:04 PM > > To: Pentax-Discuss Mail List > > Subject: Re: DA 55-300 LBA > > > > > > > > ----- Original Message ----- > > From: "Toine" > > Subject: DA 55-300 LBA > > > > > >> After a small price drop I couldn't resist the new 55-300 any longer. > >> A very nice lens. Lots of plastic fantastic but it feels well build. > >> The lens doesn't creep like the 80-320. The 16-45 feels cheaper. Image > >> quality is very good. Corner sharpness could improve a little. The MTF > >> program line wants 5.6 @ 55mm [EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL > >> PROTECTED] and > >> [EMAIL PROTECTED] The results at these apertures are excellent and most > >> suprising 300 mm is very good at f8 even at 1.2 mm, it doubles as a > >> nice macro lens. Didn't try wide open. Sometimes a little CA and if > >> visible repairable in lightroom. Purple fringing is allmost non > >> existing. The 16-45 has much more CA and purple fringing problems. > >> It comes with a nice hood and pouch. > > > > > > -- > > 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. > > > > > > -- > 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.
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