Archived posting to the Leica Users Group, 1999/01/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Peter, I feel really weird doing this but I'll defend Eric's argument, since he is away for a few days ;-) From Canon lens FAQ (I already posted this a few days ago): QUOTE "Depending on the purpose, Canon now uses 4 different aspherical lenses in its products: (1) a ground aspherical lens; (2) a glass-mold aspherical lens; (3) a high-precision, plastic-mold aspherical lens; and (4) an ultraviolet cure resin-coated replica lens. Among them, the wide-bore, ground aspherical lens is employed in the L lens series for performance improvement. " UNQUOTE So, this time he was right... (dunno which lenses use the plastic elements though) Please do not hold this against me ;-) Alan Kotsinadelis, Peter (Peter) wrote: > > Eric, > > Your wrong about Canon and their lenses. They use all glass aspheric > elements in their lenses. > > Here are clips from their Press Releases to confirm this (did my homework > this time). > > Canon ELPH: > .....ultra-sharp 24-48mm all -glass aspheric lens; > > Canon EF 28-135 f/3.5-5.6 IS USM zoom lens: > > Optical construction of the lens includes the use of a glass-molded aspheric > element for high image quality. > > Peter K > > -----Original Message----- > From: Eric Welch [mailto:ewelch@ponyexpress.net] > Sent: Sunday, January 24, 1999 6:44 PM > To: leica-users@mejac.palo-alto.ca.us > Subject: Re: [Leica] Re: glass or plastic > > >Can anyone else comment on whether or not the ASPH element in the > >latest 35/1.4 is plastic or glass (or did I misinterpret the post)? > > I've never heard it was glass. I don't think it is. > > And do know Canon uses a hybrid Aspheric element that is part glass part > plastic in some of its consumer lenses. > > Eric Welch > St. Joseph, MO > http://www.ponyexpress.net/~ewelch > > Canadian DOS prompt: EH?\>