Archived posting to the Leica Users Group, 2009/06/05

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Subject: [Leica] FS: 21/2.8 Elmarit ASPH 6-bit
From: jbm at jbm.org (Jeff Moore)
Date: Fri, 5 Jun 2009 04:01:52 -0400
References: <E833C2C4-23C6-4F12-B504-540788F57FB4@gmail.com> <C64E428F.4F882%mark@rabinergroup.com>
 
2009-06-05-03:33:35 Mark Rabiner:
> I would love to read Erwin's take on what a 77mm filter size on an optic
> which should be the single easiest to design does.

There are competing design axes:

  Compactness

  Light Gathering

  Vignettinglessness

  Great Taste

  Less Filling

You can't have all of them, and if you relax one, you can have more of
the rest.

> It has a Ring-type ultrasonic focusing motor.
> I like the sound of that!
> 
> I wish I knew what kind of rings though!

Maybe from Mordor.  But probably from Nibelung.

 -Jeff
Replies: Reply from mingthein at gmail.com (Thein Onn Ming) ([Leica] FS: 21/2.8 Elmarit ASPH 6-bit)
 In reply to: Message from mingthein at gmail.com (Thein Onn Ming) ([Leica] FS: 21/2.8 Elmarit ASPH 6-bit)
Message from mark at rabinergroup.com (Mark Rabiner) ([Leica] FS: 21/2.8 Elmarit ASPH 6-bit)