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: mark at rabinergroup.com (Mark Rabiner)
Date: Fri, 05 Jun 2009 03:44:35 -0400
 
I think I just read last night the nikon has a worm drive motor.
As that's their thing. Worm drives. And not ring worm. Just regular worm.
They had to come up with something Canon did not have a Patent on.
I think they did or still do on the rings.


Mark William Rabiner



> From: Thein Onn Ming <mingthein at gmail.com>
> Reply-To: Leica Users Group <lug at leica-users.org>
> Date: Fri, 5 Jun 2009 15:34:53 +0800
> To: Leica Users Group <lug at leica-users.org>
> Subject: Re: [Leica] FS: 21/2.8 Elmarit ASPH 6-bit
> 
> Still vignettes, as does the Nikon 50/1.4 AFS which also has a ring
> motor - to be precise it's a coreless DC motor whose lens elements
> sit in the hole where the motor spindle normally goes, and the
> helicoid is wrapped around that whole bundle.
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)