Dear D700 users, I have been using AF, CH, with 51 point 3D predictive focus, with a Nikon 24-70mm NED Lens. I have experienced, with a fast moving subject(running puppy) that the focus point goes all over the place - her tail, her feet, the ground, when I have tried to put it on her eyes. It seems to be predicting too much, and wrongly so. Thus today I tried a different choice. I tried using 51 point today, no 3D(I think this prevents the predictive focus by the camera). Same subject. It seemed to do a little better, although the light hurt me, I was wide open and only had 1/200 sec (not fast enough for this puppy) or so, very cloudy.
Do others have this issue, and relent to using 51 point (no 3D)? This would apply, I would think, with moving children, puppies, dancers, anything faster than a butterfly !!). Thanks, Debra (photos posted under "Pets" forum)
Just got my D700 yesterday and so what I am saying may not be 100% correct. It says on page 286 of the User Manual that "3D tracking may not produce the desired results with subjects that are the same color as the background or that occupy a very small area of the frame". Could that have been the problem in your case?
May be Dynamic Area AF with 21 points could do better?
Sun 28-Dec-08 03:01 AM | edited Sun 28-Dec-08 03:03 AM by brad_nikon
I'm speculating, but it might be a case where "less is more", as in more efficient and requiring less processing power?
This makes me wonder when 51-point focusing is better than other settings.
Would 51-point focusing be a feature to pacify marketing, marketing, marketing? I don't know, but me wonders. (Afterall, on this very forum, we see people arguing shallow market-driven features as worthy virtues to compare with other models or brands of cameras.)
Thanks very much also Hussam, Jeff and Alan; I did experiment with 21 point AF and had a little better results. My next experiment is with the lock on choices and I will see how I do on those. I am using the AFS lens (Nikon 24-70 NED f2.8) so the lens should be fast enough. I still had many throwaways due to focus point being off; perhaps it is my aim with the camera, I dunno, I will pay closer attention. I'll do this hopefully on the next day I'm off in daytime with sunshine outside, Wed. afternoon or Thursday I hope, and report back. I may even try 9 points.
I appreciate the help. It is frustrating to me to have such a nice fast camera, and a fast AFS lens, and not have my settings right to capture this fast puppy and stop the action and be in focus(and she is faaaassssst, whoosh). I will also bump up the ISO to allow a faster shutter speed with an aperture of around 4.5 or 5.6 or so(don't want to get too much DOF so I can concentrate on the subject, not the grass all around). Thanks very very much. Will report back. Debra
Maybe the answer is to get slower dogs! Those Blue Tick Hounds look like they can run. Have you considered a Basset Hound or Bull Dog? Have you tried shooting them with my old D2Hs? Seriously, Debra you are a class act so my hope for you in 2009 is that you get your situation resolved--very quickly.