Quote Originally Posted by FiReSTaRT View Post
Shapton site. According to them, 15k is at just under a micron and 30k is 0.49 micron.
There's a lot of inconsistency here because there are two different ways to specify grit. azjoe posted a document about this.

In any case, we have Norton's table and we have one on the diamond pastes, and at least those two agree, placing .5 micron at 50K and .25 at 100K.