Archived posting to the Leica Users Group, 1999/09/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Art, Certainly, Leitz ground its two aspherical surfaces for the original Noctilux 1:1.2/50. Canon too grinds aspherical elements for a number of its lenses, and Nikon for the aforementioned Noct-Nikkor, and according to various rumours, the tank-like 300mm 1:2 lens. A friend of mine who shall remain nameless who works for Nikon has told me that the Noct-Nikkor lens craftsman pretty much ground the front element by hand, then checking his work with a master, observing the resultant Newton rings. Only a small number of glass can be moulded, and the diameter is quite limited. - ----- Original Message ----- From: Art Sala <artsala@earthlink.net> To: <leica-users@mejac.palo-alto.ca.us> Sent: Monday, September 13, 1999 7:49 PM Subject: Re[2]: [Leica] Plastic Aspheric Lens Elements 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.