Archived posting to the Leica Users Group, 2010/03/31
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I always admired Leica lenses because they were extremely well built. When I set my camera down hard I took consolation in the fact that the lens elements were mounted in there rock solid. Perhaps that's why it's difficult for me today to warm up to a lens where the elements are moved around by who-knows-what kind of little mechanism. It's sort of neat that a little thing-a-ma-jig can determine whether or not -- and more impressively how much and what direction -- I'm shaking, and that it can quickly compensate for that. But again, I think I prefer that all elements be well cemented and that those that move are in helicoids machines to extremely tight tolerances. But that's just me. :-) Here's how I think IS came into being. Some engineers were talking one day about digital sensors being smaller, and therefore effective focal length would be shorter (i.e. a normal lens was 15mm not 50mm). One of the engineers suddenly realized how that might confuse those of us from the older school; those of us who based our lowest acceptable hand held shutter speed on the inverse of the lens focal length. So they went to the drawing board and invented IS to compensate for this change. -----Original Message----- From: lug-bounces+drodgers=casefarms.com at leica-users.org [mailto:lug-bounces+drodgers=casefarms.com at leica-users.org] On Behalf Of rmcclure2 at woh.rr.com Sent: Wednesday, March 31, 2010 8:36 AM To: Leica Users Group Subject: Re: [Leica] Micro 4/3rds I believe it has to do with the fact that IS is built to compensate shake. It does this by allowing the lens group to unlock and move. When there is no shake, like when on a tripod and IS is on, the unlocked lens group is subject to electronic feedback which can induce vibrations. Rob Sent from my Verizon Wireless BlackBerry -----Original Message----- From: Pasvorn Boonmark <pasvorn at boonmark.net> Date: Tue, 30 Mar 2010 23:53:31 To: Leica Users Group<lug at leica-users.org> Subject: Re: [Leica] Micro 4/3rds On Tue, Mar 30, 2010 at 8:41 PM, Sonny Carter <sonc.hegr at gmail.com> wrote: > > > > > > If you put the camera on a tripod you should turn off the image > stabilization. It will screw the shot up. > > > Sonny, I'm always wondering why IS does that. I need to do some research on this. -Pasvorn _______________________________________________ Leica Users Group. See http://leica-users.org/mailman/listinfo/lug for more information _______________________________________________ Leica Users Group. See http://leica-users.org/mailman/listinfo/lug for more information