I have a Nikon 400mm vr 2.8 I have had a problem with it since I purchased it. It does not hold focus but continues to fine focus until the shutter is pressed. I sent it in to Nikon and got it back but it continues to do the same thing. I have cleaned the contacts and tried the lens on my D4, D3s and D700 with the same results. Any ideas out there before I send Nikon another $500.00? Thanx
Thanks folks, I tried it in both AF-C and AF-S and indeed it only chatters in AF-C. I attempted this also with my 200-400 and 28-300 and they chatter in AF-C also but will hold focus if the subject and camera are both static. My tests have all been with the cameras on a tripod and the subject was a 2x6 on the deck. My question now, if the camera, lens and subject are completely static (on a tripod), should the lens hold focus once the target (large object) is acquired or should it still chatter (in AF-C). Again, thank you all for your help.
>My question now, if the camera, lens and subject are >completely static (on a tripod), should the lens hold focus >once the target (large object) is acquired or should it still >chatter (in AF-C). Again, thank you all for your help.
For what it is worth,this was one of my concerns when I got my D800, and now to a lesser degree the D4. My D300 would lock on and just sit quietly, but both of these cameras continue to (I guess) fine tune the focus almost regardless of how static the situation. I say "almost regardless" as the brighter the light, the more steady the camera and more steady the subject the less it is, but it is never still.
On all lenses, so kind of the reverse of you.
I finally decided I didn't care unless it seemed to affect the final image, and it doesn't. Does yours? Or is it going visibly in and out of focus?
Another silly question and apologies if it is obvious - anything resting on the buttons, or touching them? When I just got a 200/F2, I found that the natural place I held it was right near one of the four buttons on the front of the lens, and I was hitting it without realizing it. I had the lens set so that their function was AF-L. This made a royal mess, as it would seem to hang, then focus, hang, then focus -- well, finally figured it out, set it to AF-ON, and at least now it does less harm (I actually wish they had an "off").
Might you or a lens hood or something be randomly activating a button?
Thanks for the heads up but that does not seem to be the problem. It wouldn't be so bothersome but you can see it go in and out of focus. I'm primarily a wildlife photographer so I'm always set on AF-C.
Out of interest have you tried activating the focus lock button on the lens to hold the focus ? See if there is any "chatter" then. Also what is focus tracking set to on the body ? Last one is the VR on. I won't use the VR on my 400, throws the AF out
It may also be the subject you're focusing on. Can you give us a sample picture of your typical subject that it's having difficulty with? AF-C is certainly a cause for this but if it is on AF-S and still hunting it may be that your subject is one of those known to cause AF problems.