Knowing the FL makes it lot easier to make a IS system. But I do believe it is possible to make a more "intelligent" solution. My idea is something like this: First it measures the camera movements, and makes a rough guess. Then a feedback system (based on data from the image sensor) tells the camera how successful the first estimate was. Based on that information you will have data for a better calculation. (A similar technique has been used with some success in subwoofers in sound systems).
This is just my non expert speculations... What I'm trying to say is: We don't _know_ that a IS system needs the FL, you are just assuming it. Tim Mostly harmless (just plain Norwegian) Never underestimate the power of stupidity in large crowds (Very freely after Arthur C. Clarke, or some other clever guy) > -----Original Message----- > From: Rob Studdert [mailto:[EMAIL PROTECTED] > Sent: 4. januar 2006 04:13 > To: [email protected] > Subject: Re: A10: Pentax Image Stabilization is here > > On 3 Jan 2006 at 21:00, Adam Maas wrote: > > > The Minolta's seem to be able to do it even with lenses mounted via > adaptor. > > If Pentax are simply using in camera gyros (I expect that this isn't > correct, > they would more likely be accelerometers) then they must have to know the > lenses FL to determine the mechanical offset to apply to the sensor to > offset > the shake. Consider the difference on the film plane that a similar > amplitude > body shake will produce at the sensor if I have my A300/2.8 and 2x TC or > my > A15/3.5 mounted? > > How the Minolta works or how effective it is I have no idea, but you can > be > very sure that the Pentax system as used in the A10 if adopted for DSLR > use > needs FL, the copy on DPReview even states it (though not very elegantly): > > "(1) Two internal gyro sensors detect the amount of camera shake. > (2) A dedicated CPU quickly calculates the necessary correction from the > amount > of camera shake and the lens´s focusing data." > > > Rob Studdert > HURSTVILLE AUSTRALIA > Tel +61-2-9554-4110 > UTC(GMT) +10 Hours > [EMAIL PROTECTED] > http://members.ozemail.com.au/~distudio/publications/ > Pentax user since 1986, PDMLer since 1998 > >
