For photgraphers only: What is the difference between Nikon and Nikkor lenses?

And Nathan. If you are here: thanks for your previous answer. Another question about D90 and D300: in the same ISO setting for both: are noise differences between them?

Nikkor is the standard designation for Nikon's lens lines. In the old days, for camera bodies, the name Nikon was only used on the high-end ones. The cheaper "consumer grade" ones were called Nikkormat. For lenses, it was Nikkor vs. Nikon lenses. Today, there are all sorts of lower-end bodies and lenses with the Nikon and Nikkor names, respectively.

As for the ISO difference between the D90 and the D300 you can take a look at this great wepage about it here, there's examples where you can really see for yourself.

http://mansurovs.com/nikon-d300-vs-d90-high-iso-noise-comparison

There's no difference. Nikkor is the brand name for Nikon lenses. There's little difference between noise at the same ISO between a D300 & a D90, but you can compare sample images from the two here;

http://www.dpreview.com/...ecs/Nikon/