Archived posting to the Leica Users Group, 1996/09/11
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Received: from lisa.servtech.com (lisa.servtech.com [199.1.22.7]) by typhoon.servtech.com (8.7.5/8.7.5) with SMTP id CAA23515 for <tmydosh@typhoon.servtech.com>; Thu, 12 Sep 1996 02:19:30 -0400 (EDT) Received: from mejac.palo-alto.ca.us by lisa.servtech.com ; 12 SEP 96 02:19:28 EDT Received: by mejac.palo-alto.ca.us id AA07744; Wed, 11 Sep 96 23:09:25 -0700 Received: by mejac.palo-alto.ca.us id AA07738; Wed, 11 Sep 96 23:09:22 -0700 Received: from ts66-16.tor.iSTAR.ca (ts66-04.tor.iSTAR.ca [204.191.137.197]) by Fox.nstn.ca (8.7.5/8.7.3) with SMTP id DAA16635 for <leica-users@mejac.palo-alto.ca.us>; Thu, 12 Sep 1996 03:09:19 -0300 (ADT) Message-ID: <3237D360.3A0D@fox.nstn.ca> Date: Thu, 12 Sep 1996 02:09:52 -0700 From: "Roger J. Flanigan" <istr1848@fox.nstn.ca> Organization: Kindermann (Canada) Inc. X-Mailer: Mozilla 3.0 (Win16; I) Mime-Version: 1.0 To: leica-users@mejac.palo-alto.ca.us Subject: Re: Comparison between old and new 35mm Aspherical summiluxes References: <199609120317.XAA16756@spherenet.com> Content-Length: 1175 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-leica-users@mejac.palo-alto.ca.us Precedence: bulk Reply-To: leica-users@mejac.palo-alto.ca.us Daniel Cardish wrote: > > Has anyone compared the earlier 35mm Aspherical Summilux with the current > ASPH Summilux? (If you've seen this question from me more than once I > apoligize; The mail keeps getting returned to me). > > Dan Cardish > <dcardish@spherenet.com> > > <http://www.spherenet.com/dcardish/photo.htm> > Hi Daniel, Roger here from Kindermann. How are things at the P.M.'s office? The main difference between the two versions of the 35 Summilux ASPH is the process used to produce the aspherical element. The new one is produced with a new method called "Precision blank moulding" in which raw glass is heated and then pressed into the aspherical form. This is a new computer-controlled process, not to be confused with ordinary bank-moulding which only fulfills low quality demands. This new automated process is much less problematic than the old "grinding and polishing" technique as it eliminates the grooves than can result with manual grinding and polishing. Some manufacturers fill in these grooves with synthetic materials, an option which is of course unacceptable to Leica. This is why they have employed this new high-tech process. Cheers!