> > From: AlunFoto <[EMAIL PROTECTED]> > Date: 2008/06/04 Wed PM 10:01:58 GMT > To: "Pentax-Discuss Mail List" <pdml@pdml.net> > Subject: Re: smc PENTAX-DA 17-70mmF4AL[IF] SDM > > 2008/6/4 P. J. Alling <[EMAIL PROTECTED]>: > > The composite elements were a spherical glass component with an optical > > plastic having an "identical" diffraction index, molded to the glass > > component to form the aspheric element. The optical plastic was the > > glue... > > Thanks, I didn't know that. Do you think they've used different > techniques on other AL lenses?
My guess would be same technique, different plastic. It's a standard lensmaking technique now. ----------------------------------------- Email sent from www.virginmedia.com/email Virus-checked using McAfee(R) Software and scanned for spam -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
