Archived posting to the Leica Users Group, 2009/06/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]The old AFD 50/1.4 has a worm drive motor driven by the camera body. The new AFS 50/1.4 G has a ring motor. The new one has slightly better optics, too. Less CA and coma when shot wide open, especially when the subject is towards the edges of the frame. On Jun 5, 2009, at 3:44 PM, Mark Rabiner wrote: > 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. > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information THEIN Onn Ming *photohorologer ming at www.mingthein.com www.flickr.com/mingthein