I'm not wedded to the technology - I just want auto focus that works as fast, and as quietly, as the best Canon have to offer.
As has been shown many times, in many different fields, direct drive offers many advantages as compared to gear trains (such as no hysteresis/backlash, better matching to the load, etc.). We may see piezo-electric USM, or we may see linear magnetic motors, or we may see something else, but I don't expect gears. Nor do I buy the arguments about precision, hunting, etc. With a simple optical positional encoder attached to the moving part it's trivial to detect position, speed, etc., and go directly to the desired setting. Pentax FA lenses supposedly already have the positional encoder (if the claims that multi-segment metering using focus distance are to be believed), and the amount of processing power needed is negligible. On Sun, Sep 03, 2006 at 12:10:17AM +0800, David Savage wrote: > I agree with everything you said. While increased speed, & hopefully > precision, are are desirable, the reduction in sound is a huge plus. > > I've taken pictures using AF at events that are relatively quite and > the sound of the lens focusing even made me jump ;-) > > Dave > > On 9/2/06, Douglas Newman <[EMAIL PROTECTED]> wrote: > <snip> > > But overall, I do not find it especially exciting. I > > don't do a lot of high speed work with long lenses so > > a slightly faster AF system is not a really big deal > > to me. I am more concerned with accuracy than speed. > > > > New Doug > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
