----- Original Message ----- From: "Godfrey DiGiorgi" Subject: Re: K20D Lens adjustment Question
> > On Mar 18, 2008, at 4:42 PM, William Robb wrote: > >> FWIW, neither my 14mm or 12-24 (at the short end) like to >> accurately autofocus with my K20. I >> suspect that it relates to the focal length being so short that DOF >> puts it is outside the >> resolution of the sensor. All my other lenses are fine. > > Doesn't make sense. The sensor in question is the contrast comparator > AF sensor, which hasn't changed from the K10D far as I can tell. > > Ultra-ultra short focal lengths like this are always the most > difficult for AF systems (and the human eye!) to manage critical > focus with. But the K20D should work the same as the K10D in this > regard ... the resolution of the capture sensor is irrelevant. > I think you misunderstand what I am trying to say. The sensor in question is the AF sensor, not the capture sensor, and I suspect that Pentax has incresed AF speed partially at the expense of AF accuracy. I suppose sensor resolution isn't so much the problem as AF system resolution. William Robb -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
