"Camera" Finish on metals


Does anyone know anything about how to produce "camera finish" on metals and which metals will be suitable. I'm sure you have read and heard about the term - camera finish as on sme and other high qualty tonearms and of course on cameras too.

I searched google and other places for the methods used but most of the information refers to cameras WITH camera finish. Is this type of metal finishing achieved by electro-chemical or vapour deposition like plating or anodising or by chemical etching?

Cheers all