Color fringing in areas of high contrast is endemic to digital sensors. But most of what you see is not CA. It's fringing, and it's a different animal. You can still fix it quite easily but not with the CA adjustments in ACR. Paul On Apr 13, 2007, at 11:11 PM, Digital Image Studio wrote:
> On 14/04/07, Brendan MacRae <[EMAIL PROTECTED]> wrote: >> What's the deal with film camera lenses and chromatic >> aberration on the K10D? >> >> Shooting wide open is a nightmare for me. Is anyone >> else seeing this issue? Is it endemic with film lenses >> plus the smaller sensors? It can't stricly be a >> function of older glass since I have seen ED IF lenses >> having the same trouble on the K10D. Perhaps only the >> newest of the newest coatings are fixing this issue? > > It's endemic with most lenses, digital sensors just tend to exacerbate > the problem, different coatings would make little difference as the > source is lens aberrations. Fortunately CA is also easy to manage when > post processing RAW images. > >> I tested the FA31 Ltd, the A*85 f1.4, the A50 1.4, and >> the FA 24-90 today, all wide open, RAW, ISO 100, and >> all of them were showing some amount of color >> fringing. It didn't go away until 2-3 stops beyond >> wide open on any of these lenses. I'm wasting time >> trying to fix the problem every time I shoot for >> shallow DOF. Would a full frame sensor make any >> difference in this regard? > > A FF sensor would likely make the CA more apparent as the angle of > incidence would be more acute towards the edges and the lenses will > exhibit more distortion towards the edges. > >> How do the DA lenses handle this? Are they free of CA >> wide open? One hopes as I have my eye on the DA10-17mm >> and the DA*50-135mm. > > Don't hope too much, the DA lenses seem to be all over the place some, > exhibit slightly better CA, some worse than their rough A/FA > counterparts. > > -- > Rob Studdert > HURSTVILLE AUSTRALIA > Tel +61-2-9554-4110 > UTC(GMT) +10 Hours > [EMAIL PROTECTED] > http://home.swiftdsl.com.au/~distudio//publications/ > Pentax user since 1986, PDMLer since 1998 > > -- > PDML Pentax-Discuss Mail List > [EMAIL PROTECTED] > http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [EMAIL PROTECTED] http://pdml.net/mailman/listinfo/pdml_pdml.net
