On 22 Jan 2003 at 15:40, Keith Whaley wrote: > Andre Langevin wrote: > > > > But it's always surprising to read in many tests that even expensive > > lenses are not perfectly centered. Does it mean that a (good) > > repairman could do better (afterwards) than the original lens maker > > did at the factory? > > > > Andre > > -- > > Absolutely not. > The only person who can do that, regardless of title, is the person > grinding the lenses to fit the various places in the lens body. > Just like, if your optician grinds your prescription lens incorrectly, > to fit your frames, your glasses will drive you nuts. > So will a decent lens.
Sure they can Keith, the lens elements may be perfectly formed (stamped, ground, polished, laminated, coated etc) and still be de-centred. The lens elements (including glued pairs or groups) most often float slightly in the mount, the assembly (or re-assembly) is the point at which centring is accomplished in most designs. As far as I recall there is some blurb on the Leica or Schneider web sites with details. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications.html
