GunCote is tough as hell and the slide on a 45 does not even have to be lubricated. Useful when throwing yourself down in the sand after running fifty metres. So I guess it has to be something different.
Don Dr E D F Williams http://personal.inet.fi/cool/don.williams Author's Web Site and Photo Gallery Updated: March 30, 2002 ----- Original Message ----- From: "Leon Altoff" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, December 05, 2002 12:36 PM Subject: Re: Lens barrel finishes - Sigma EX > On Thu, 5 Dec 2002 09:03:36 +0200, Dr E D F Williams wrote: > > >I have often wondered about the EX finish on Sigma lenses; its black and > >hard. Reminds me of the Teflon based stuff I used to have sprayed on my 45 > >colt slides. It was called GunCote and was baked on after being sprayed onto > >a finely sandblasted surface. (As a hobby I used to customise hand guns, and > >shoot them.) GunCote could be used on any metal and later I had optical > >bench parts coated with it. I'm quite sure that lens barrels could be > >GunCoted. Perhaps its the same stuff? > > > Don, > > I don't think it's the same stuff. If it is then it wears easily. I > have a Sigma 105f2.8EX Macro and the finish is wearing on the edge of > the focusing ring from being put in and taken out of a camera bag. > Apart from that the lens is still in perfect condition. > > > Leon > > http://www.bluering.org.au > http://www.bluering.org.au/leon > >
