Archived posting to the Leica Users Group, 1999/09/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]- --=PMail:=_0000@@uCV5Ob00sdmDdkxmQawU Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Ken: I heard that Zeiss is the only lens manufacturer that has the ability to grind glass aspheric elements. Then again, I don't know if it matters (photographically speaking) whether the aspheric element is ground glass, moulded plastic or some sandwiched hybrid. Maybe some other lug lens guru can give more technical insight. Cheers, Arturo =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D From: "Ken Iisaka" <kiisaka@ibm.net> To: Internet Mail::[<leica-users@mejac.palo-alto.ca.us>] Subject: Re: [Leica] Plastic Aspheric Lens Elements Date: 9/12/99 8:47 PM The Noct-Nikkor was indeed hand ground. The one and only guy who was responsible for making the aspherical front element retired years ago, and the production ceased several years ago. It is still listed on Nikon USA's catalogue, but it was taken out of the Nikon Japan catalogue about a couple= of years ago. Several Japanese publications such as Asahi Camera have stated that Hoya supplies moulded aspherical elements to Leica. > Leica uses glass in its ASPH lenses. They *may* use plastic in their > 'lower' priced Japanese made zooms, though I am not sure of this. Nikon > certainly uses plastic resin elements in some of its aspherica zooms. I > suspect that their 50/1.2 Nocti uses glass. Not sure about Canon or Zeiss. > I think you can tell by the relative price. Plastic aspheric elements are > designed to produce decent optics at lower prices. Many of the aspheric > zooms offered by sigma and other 3rd party lens manufacturers employ > plastic elements. - --=PMail:=_0000@@uCV5Ob00sdmDdkxmQawU--