Archived posting to the Leica Users Group, 2008/09/26
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Kyle Cassidy <kcassidy@asc.upenn.edu> wrote: > is that not though the very nature of what IS lenses do? focus on the scene and hold > it steady, ostensibly i guess, by picking points in the scene and moving the image (or > the sensor) so that those points are always hitting the same place on the ccd during > the length of the exposure? Optical stabilization such as Canon IS and Nikon VR shift elements in the lens in response to signals from gyroscopic sensors in order to move the image counter to the camera's movements. They do not move the camera's sensor. The advantages have been well-described. Disadvantages include the lag to bring the gyroscopes up to speed, additional power consumption, adding several air/glass surfaces to the optical system, and the off-center optical effects from the shifted elements. Doug Herr Birdman of Sacramento http://www.wildlightphoto.com -------------------------------------------------------------------- mail2web LIVE ? Free email based on Microsoft? Exchange technology - http://link.mail2web.com/LIVE