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: mingthein at gmail.com (Thein Onn Ming)
Date: Fri, 5 Jun 2009 15:34:53 +0800
References: <C64E428F.4F882%mark@rabinergroup.com>

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.

On Jun 5, 2009, at 3:33 PM, Mark Rabiner wrote:

> I was just looking up 50 1.4's as I saw the Sigma
> And its filter size is 77.
> I thought I was looking at a 14 2.8
>
> The Nikons is of course using a 52mm filter size and the Pentax a 49mm
> filter size.
> The Canon 50 1.4 is not its classic 55 mm canon filter size but 58mm.
>
> I'd love to know what goes into this Sigma lens.
> 500 bucks it cost.
>
> 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.
> I would guess no vignetting issues at all. Just a guess.
>
> http://www.dpreview.com/news/0808/08081802sigma50review.asp
>
> It has a Ring-type ultrasonic focusing motor.
> I like the sound of that!
>
> I wish I knew what kind of rings though!
>
> Newton?
> Lord of?
> Van Allen?
> Ring Cycle?
> Ring around the collar?
>
>
> Mark William Rabiner
>
>

THEIN Onn Ming
*photohorologer ming at www.mingthein.com
www.flickr.com/mingthein







Replies: Reply from hopsternew at gmail.com (Geoff Hopkinson) ([Leica] FS: 21/2.8 Elmarit ASPH 6-bit)
Reply from mark at rabinergroup.com (Mark Rabiner) ([Leica] FS: 21/2.8 Elmarit ASPH 6-bit)
In reply to: Message from mark at rabinergroup.com (Mark Rabiner) ([Leica] FS: 21/2.8 Elmarit ASPH 6-bit)