RE: To David Soderman: A Little Test

[rafe.bustin@xxxxxxxxxxx]

On 10 Apr 2002 at 10:40, Paul D. DeRocco wrote:

> I don't think it could be, because then it wouldn't be able to do superfine
> mode with a single line. 

How do you figure?  If it's a monochrome CCD, then 
it takes turns sensing R, G, and B, by virtue of 
illumination by either R, G or B LEDs.  You could 
do that with one line, or with N lines.


> It sounds like it's three lines, each of which has
> RGB sensors, whose only purpose is to be able to capture three scan lines at
> a time. I don't think the fact that there are three lines has anything to do
> with the fact that there are three primary colors--they could have used a
> four-line CCD and made it four times as fast as superfine mode.


Yep, I think you have that part right.  Or it could be 
that the physical sensor is made in two versions -- 
with RGB filtering layered onto the CCD cells, or 
in a monochrome version, without the RGB filtering.

The LS-120 might use the filtered version, since 
it's using a "white" light source.

Since Nikon's big shtick is the LED illumination, 
they'd go for the monochrome version.


rafe b.

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