At 5:28 PM -0700 10/26/02, Winsor Crosby wrote:
I thought the main issue with wide angle lenses was related to the fact that
the sensor isn't capturing the full RGB for each pixel and the interpolation
only works well when the light is coming in at a right angle to the sensor
(or close to a right angle). Which is why you see the bands of Red, Green,
and Blue along the edges when using a wide angle. That's based on my
relatively weak understanding of the issues so I could be 100% wrong here.
But, if that is the case, then I'd think that the X3 chip would produce much
better results with wide angle lenses than a conventional sensor.
Andrew "frugal" Dacey
I don't really know anything either, but my understanding is that
the banding is a result of increasing angles of the light toward the
edge of the chip and that it has to do with the pixel sensor being
recessed on the chip. Since the Foveon stacks sensors for each
color at each point on the sensor it seems to me that the bottom one
is going to be evenly more recessed.
Since each layer of sensor material is laid down (or ion-implanted, or etched)
in a separate operation, it would be a fairly straightforward matter
to offset the stacks so that light went more or less straight down.
Of course, this would need to be optimized for particular lenses (or
at least nodal points) but is not ultimately out of the question.
Right now, designers seem to be having enough trouble getting the
sensors to function at all, though
paul
--
Paul Wallich pw@xxxxxxxxx
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