Many of us remember the Oly presentation that explained why OM lenses
would not be usable on a digital body. To a certain extent Canon and
Nikon have shown it to be exaggerated, but it is interesting to see
the latest Luminous Landscape article has a reference to colour
shifting across the sensor.
http://www.luminous-landscape.com/reviews/cameras/P45-SWD.shtml
Of course it's relatively straightforward to correct for this in
firmware/software (I've read that Canon already make sharpening
in-camera, even of the raw files)
"One design problem with extreme wide angles on digital sensors is a
colour shift at acute incidence angles. This lens shows a distinct
magenta to green shift from the centre to the edge which exaggerates
the falloff. Fortunately the Phase One Capture One Pro 3.7.3 software
includes a facility for calibrating this hue shift, for each lens and
at any movement setting. You simply cover the lens with the white
perspex calibration panel and shoot a frame. Import this into CO and
under the Colour Balance tab there is an option to Colour Calibrate
the lens. You need to do this for different light sources and for each
lens, but the software corrects for colour shifts and a bit of
falloff. It works well in practice and is a snap to actually do."
br
jez
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