What grit/size do you suggest ?

I already bought Size:1800Mesh-8(um) - 0.008mm from ebay but I am not sure it is the right one. The seller (from China) have (almost) every size.

Quote Originally Posted by Nodda Duma View Post
Having worked in an optical shop, I have some familiarity with grinding & polishing optics. Barring a grinding station, hand grinding is best way to achieve a consistent and even finish.

Silicon carbide is awfully coarse. Why not use aluminum oxide in a finer grit?