On 15 Dec 2003 at 14:14, Chip Louie wrote:
> Hi WJM,
>
> Even on film in high contrast lighting the EF 14 2.8L displays some
> chromatic aberrations in the extreme corners. It seems to be worse on the
> EOS 1Ds but it's not so big a deal now with Photoshop CS and ACR's chromatic
> aberration correction feature. On film you really don't see it except under
> poor conditions and the far corners.
>
> HTH
The German ColorFoto mentioned that some camera's can/could do this
pixel-shadowing correction (see other posting) in-camera, but it
would require longer data-aquisition times.
And even though CF didn't say it: this also requires a lens-depending
set of correction-parameters....aftermarket lens manufacturers
probably won't like this at all....8-))
Another interesting factor: reflection from the sensor, back to the
rear element of the lens, back to the sensor....degrading contrast.
Hence improved anti-reflection coating on the rear of some lenses (it
depends on the shape and distance of the rear lens element whether
the problem is significant it seems).
--
Bye,
Willem-Jan Markerink
The desire to understand
is sometimes far less intelligent than
the inability to understand
<[EMAIL PROTECTED]>
[note: 'a-one' & 'en-el'!]
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