Nikon cross-type sensor

Bill wrote:
Here's something on which I can't seem to find anything conclusive. In
relation to the autofocus systems in several Nikon cameras:

"...the center AF sensor is cross-type, able to respond to subject
detail oriented either horizontally or vertically..."

I've seen this mentioned and I know exactly what it means and how it
improves autofocus performance.

But since I come from the Canon camp, I know that with Canon cameras the
high precision cross-type sensors are only useful with bright lenses,
specifically if you have an f/2.8 or better lense attached. The high
precision cross-type sensor does not help with kit lenses like the 18-55
f/4-5.6 or even L glass like the 17-40 f/4, although the regular sensor
does work up to f/5.6.

I think with Canon, the side AF points need large aperture to enable 2D
high precision. The center AF point is always 2D high precision even
with f/5.6 lenses.

http://digitcamera.tripod.com/#slr