per wikinpedia, Other explanations: Purple fringing is usually attributed to chromatic aberration, although it is not clear that all purple fringing can be explained this way. Other attributed causes of purple fringing in digital photography include many hypothesised sensor effects:
Chromatic aberration in each CCD cell (microlenses) Digital noise in dark areas Image processing and interpolation artifacts (almost all CCDs require considerable processing) Stray ultraviolet light Stray infrared light Image bloom from overexposure Leaks between cells of the CCD ============================================================ CA is CA, if its not CA, then its usually called purple fringing which is not the lens, its a sensor proplem of some sort.... jco -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Sunday, July 13, 2008 3:54 PM To: Pentax-Discuss Mail List Subject: RE: DA 55-300 LBA Please see this as well: http://en.wikipedia.org/wiki/Purple_fringing 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. -- 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.
