Sometimes the fringe is not caused by the lens but the imaging chip, be it
CCD or CMOS.

All chips have a "lens" built into them for light gathering. It is micro
etched onto a layer just above the sensor. The problem comes from when the
light path into the sensor is not perpendicular to the lens on the sensor.
As these are essentially simple meniscus lenses, chromatic aberration
happens. It is very noticeable with wide angle lenses, This is why several
manufactures have created "digital" lenses to move the rear element of the
camera lens further away from the sensor, which minimizes the effect.



"Steven" wrote in message
.. .
ck (Just Plane Noise) wrote in
:



I prefer Image 105 to 101. How about you?

Looks to me that the purple fringe was replaced by a yellow one, equally
unsharp.

Perhaps the answer lies in a better lens?
As far as I know, chromatic abberation is caused by the lens, not the
camera, so the best policy is to tackle the problem where it occurs.

But I'm not a professional photographer, so this is just my two cents...

And yes, the yellow in the top wing looks much better in pic 105, but
unfortunately the publicity on that wing now suffers from artefacts.

Not that I could have done any better, but since you asked for an
opinion... ;-)


Cave putoriem,

Steven