Bruce, Thanks for the explanation. I guess I don't shoot to many runners <g>. Although, I did do some lads playing football. I used just the middle sensor with servo, and had very few soft shots. I agree about the 'having the subject in the middle' problem, but I was always trying to fill the frame, so didn't seem to have a problem.
http://www.macads.co.uk/snaps/photoessays/football.html I do accept your point though and can see how it could be useful. Cheers, Cotty >More sensors make sense when you have focus tracking capability. Then >you are working with a moving target and don't want to frame dead >center. Simple example is people. Normally the eyes are most >important. So you would want to have a sensor in a position where >they eyes might be. That way you can pan and have the composition >proper. What if you are shooting vertically - same problem. The >extra sensors make it possible to compose properly, pan (track) the >subject and keep it in focus. For Pentax, the MZ models (except MZ-S) >don't even have focus tracking (true servo) so they really wouldn't >benefit from many sensors. The PZ-1p can focus track but only has a >middle sensor, so you subject is going to be dead center of picture >always - not ideal (in fact, poor quite often). The MZ-S can focus >track and has selectable focus points. It's problem is that they are >not cross sensors so it is still possible to not be able to focus >depending on your subject, orientation of the camera and composition >you have planned. > >Imagine something as simple as a runner going by. With the MZ series >(not MZ-S) you would struggle to get one shot by pressing all the way >down on the shutter and hope it focuses and fires while the subject is >still in focus (predictive AF helps some here). With the PZ-1p, you >would switch to servo, pan the camera with the runner, fire as many >times as you want knowing and seeing that his torso is in perfect >focus. Of course if he is leaning and your DOF is shallow, his head >may not be in focus. With the MZ-S, you would switch to servo, choose >the AF sensor that is where the runners head is, pan the camera with >the runner and fire as many times as you desire knowing that the >runner's head will be in perfect focus (unless the lack of cross >sensor doesn't allow it focus). > >HTH, > > >Bruce ____________________________________ Oh, swipe me! He paints with light! http://www.macads.co.uk/snaps/ ____________________________________ Free UK Macintosh Classified Ads at http://www.macads.co.uk/ ____________________________________
