----- Original Message ----- From: "Jani Patanen" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, December 16, 2003 11:50 PM Subject: Re: EOS Is in-camera IS the better way?
> Skip Middleton wrote: > > If you were dealing with digital only, you may be right, moving the sensor > > could be a better solution, after all, the sensor probably weighs less than > > the IS element(s) in a lens, thus could be made to move faster with less > > power draw, > > That's not the issue. If you think about it bit closer: Shake = rapid > velocity changes. Eliminating shake = trying to keep velocity constant > -> no acceleration. WE all (well most at least) know the basic formula: > F = ma (Force equals mass times acceleration). When we eliminate > acceleration, there is no shake, hence no force if needed to move the IS > group. > > What it does have effect on is the point when the "free space" where the > IS group can float runs out and it has to start moving, then there is > strain between the IS group and the lens body. > > (darn it's difficult to explain things in other than your native language) > > > Well, yes, but than may require a mass that would obviate the need for IS, since it would be so heavy as to require a tripod just to hold it up! <grin> Or, if you are talking about the acceleration (or lack thereof) of the hypothetical IS enabled sensor, it would need to be so light weight to avoid mass, so perfectly balanced so as to not move when the camera moved, and the bearings would need to be so void of friction, that it might defy the ability of most manufacturers to actually produce such a sensor. To, the changes in light angle when the lens moved but the sensor didn't might introduce some interesting distortion... Or am I just being obtuse? Skip Middleton www.shadowcatcherimagery.com * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
