There are horizontal and vertical movement sensors that feed to a controller which also knows the focal length (and the focus distance, I believe, with F/FA/DA/D-FA series lenses), calculates the amplitude and direction of the movement, and then moves the sensor on a magnetic cushion to compensate.
The shake reduction system is tuned to manage vibrations in the range of amplitudes usually seen in human musculature. When the camera is on a tripod, the range and frequency of the vibrations are quite different, often beyond the ability of the control system to manage, which can cause the stabilization system to increase the amount of motion blur in the captures rather than decrease it under certainly circumstances. For this reason, and maybe for some tiny increment of savings in power consumption, they recommend that the AS be turned off. I have not found that it matters overly much with my tripod and the lenses that I normally use with the cameras I've had that supported image stabilization in the past, however I have not had much experience with the K10D in this regard as yet. Godfrey On Dec 21, 2006, at 9:25 AM, Barry Rice wrote: > Can anyone 'splain to me how the K10D actually achieves the shake > reduction > feature? (And I don't mean how do I turn it on...heh heh) >> From the perspective of a former astronomer, I'm just curious of >> how this is > being affected. Is the sensor somehow hooked up to some kind of > inertial > reference? > > Also, why does the manual tell you (over and over) NOT to use the > shake > reduction when the camera is on a tripod? There must be some kind of > incompatibility....some times I'm shooting little critters with a > big lens > on an overly-small tripod, and I'm wondering if the shake reduction > would > help.... -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
