For these shots I used Auto Selection of focus points. Because the boys were a bit away from me, it worked surprisingly well (the distance beteen me and the boys didn't change much): http://www.flickr.com/photos/bladt/sets/72157594200497565/show/ The four soccer-shots were taken within 2-3 seconds (according to the the EXIF-data) between 19:35:10 and 19:35:12, July 15th 2006). Regards
Jens Bladt http://www.jensbladt.dk +45 56 63 77 11 +45 23 43 85 77 Skype: jensbladt248 -----Oprindelig meddelelse----- Fra: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] vegne af Jens Bladt Sendt: 28. december 2006 09:25 Til: Pentax-Discuss Mail List Emne: RE: *istD AF Yes, so it seems. Only in the PDF-manaul this is page 72. So, what does it do, when the subject is fixed and YOU move the CAMERA? It may work fine in theory. But in the real world, the images rarely turn out sharp, if the subject is moving. I can say this because I used this camera close to every day for 28 months, releasing the shutter appr. 45000 times. Perhaps the micro chip can cope (which I doubt), but the speed of the whole system is still slow compared to the mayor players in the high end DSLR segment. To me this is not very important, since I don't do sports photography (perhaps the camera limitations are the real reason for this). When I shoot images like these I use manual focus, because I can't release the shutter at the decisive moment if I use AF: http://www.flickr.com/photos/bladt/sets/72057594101295335/show/ For pro photographers this is obviously a major issue, since they tend to choose faster cameras. I plan to buy a K10D anyway, regardsless that it is using the same old (2003) SAFOX VIII system. Obviously the speed is is not a huge priority for Pentax. Luckily it's the same for me. Regards Jens Bladt http://www.jensbladt.dk +45 56 63 77 11 +45 23 43 85 77 Skype: jensbladt248 -----Oprindelig meddelelse----- Fra: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] vegne af Frits Wüthrich Sendt: 27. december 2006 23:14 Til: pdml@pdml.net Emne: Re: *istD AF Taken from the *istD manual page 74: " The camera switches to predictive AF mode automatically when a moving subject is detected in AF.C (Continous mode). " Frits Wüthrich On Wednesday 27 December 2006 22:36, Jens Bladt wrote: > No, I doubt that this camera does feature predictive AF - it doesn't really > track or calculate anything AFAIK. Predictive AF means calculating where > the subject will be at the actual time of release - using calculations > based on the pattern that a moving object describes on the focus screen. > The *ist D does not do such calculations, does it? It's not exactly F16 > weapons technolgy :-) > > Even if it did, it wouldn't work well when the object is moving very > directly towards the camera - then there is only VERY little movement to > calculate (the movement caused by the subject changing it's size as it's > getting closer or farther away). All it does is focus on what ever is > close or has high contrast. It's really just a focus trap - that is always > a little bit too late. > > Secondly I never let the camera choose the AF point. I always use the point > in the middle. So, this can't be the reason for my shots beeing unsharp > either. The only reason I can think of is that it doesn't focus properly on > moving objects, because it's too slow. When ever the red square appears, > the object is allready out of focus again, before the shutter fires. > > The K10D and the *ist D does have the same generation AF system, according > to dpreview; the SAFOX VIII. > I have never heard or read anywhere, that this system had predictive > autofocus. > > The PZ-1 was said to have this (according the the user manual - which says > about SERVO mode: "The predictive autofocus function is effective in this > mode"). But I seriously doubt that the camera computer actaully did such > focus calculations or really is very predictive. > > Even if they have just NAMED the servo mode/continuos mode "predictable > autofucus" - it's still not very fast, is it? > > Regards > Jens Bladt > http://www.jensbladt.dk > +45 56 63 77 11 > +45 23 43 85 77 > Skype: jensbladt248 > > -----Oprindelig meddelelse----- > Fra: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] vegne af John > Francis > Sendt: 27. december 2006 21:12 > Til: Pentax-Discuss Mail List > Emne: Re: *istD AF > > On Wed, Dec 27, 2006 at 04:47:49PM +0100, Jens Bladt wrote: > > Very nice photograph - in fact it's excellent! > > This was not done with continous AF, was it? Well, at some distance any > > photograph is always sharp. Only not necessarily where you wnat it to be. > > In my experience the *istD AF/Continuos AF is not fast enough for > > anything movuing faster than a walking human. I have pointed this out > > many times on this list. Other list members allways seem to answer me, > > that shots like this must be done using MF. > > That's a misrepresentation of the history. When you've posted examples > in the past, it's often been pointed out to you that the problem lies with > the selection of the auto-focus point. The camera is quite capable of > tracking moving objects at speeds well in excess of humans walking (as > photographs from myself and Doug Franklin, amongst others, demonstrate). > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.409 / Virus Database: 268.15.28/604 - Release Date: 12/26/2006 > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.1.409 / Virus Database: 268.15.28/604 - Release Date: 12/26/2006 -- -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.409 / Virus Database: 268.15.28/604 - Release Date: 12/26/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.409 / Virus Database: 268.15.28/604 - Release Date: 12/26/2006 -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.409 / Virus Database: 268.15.28/604 - Release Date: 12/26/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.409 / Virus Database: 268.15.28/604 - Release Date: 12/26/2006 -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
