D90 Automatically Moves While Bracketing

[Lrk]

While i was working on a HDR timelapse i noticed something strange.
I was using the 3 step bracketing (since the D90 doesn't have a firmware update to a 5-step as far as i know). The D90 was mounted on a very firm and stable tripod. The first of the 3 shots (under) of each set was always pointed slightly downwards, the other 2 were perfectly aligned. After taking the 3rd shot it would immediately move back down again even if the next set was several seconds away.
It's not a big problem, but i can't find the cause. I tried to look at the camera when it was taking the shots, but it doesn't seem to move.
I drew a line were the top of the chimney was suppose to be.

OfftopicPS: Yeah, i noticed the buildings were underexposed, so i changed it a little in the next sets.

 

[pbelarge]

My T1i did a very similar thing with bracketing. The third shot of bracketing was off by a hair and usually out of focus.

 

[KmH]

The EXIF for the 3 images all show 1/4000, f/11, ISO 200, -2EV, Manual mode, Matrix metering.

Something doesn't compute.

 

[Lrk]

I loaded them as layers in Photoshop, added a 4th for the line (so it's in the same place) and then exported the layers manually. It's probably from there.

 

[NateS]

AF or MF? I'm guessing AF and the image will change just slightly when focus changes.

 

[robertwsimpson]

I'll bet you had it on AF and AI Servo (or whatever the Nikon equivalent is called)... Just flip to MF for autobracket shots. Problem solved!

 

[supraman215]

Robert means turn VR off.

 

[robertwsimpson]

No, I'm pretty sure I meant turn AF off. Turning VR off would also be a good idea... I assume everyone does that when using a tripod.

 

[KmH]

AF or MF? I'm guessing AF and the image will change just slightly when focus changes.

Good call. :thumbup:

 

[Lrk]

I may be noobish, but i'm not that noobish. It was on manual focus. But VR was on. I'll give it a test run tomorrow and let you know. Thanks.

 

[supraman215]

I may be noobish, but i'm not that noobish. It was on manual focus. But VR was on. I'll give it a test run tomorrow and let you know. Thanks.

Focus will not MOVE an object that's why I thought Rob meant VR. It may bring a blurry object into focus therefore moving the edge of the object closer to the object's center but that building was in focus to begin with.

 

[robertwsimpson]

Do an experiment. The view through my lenses changes slightly when focusing. I'll bet yours do too.

 

[D-B-J]

which lens? because iknow that my 105mm micro will breathe a little, and may change the positioningly slightly when in AF.

 

[Dao]

VR on? Can you try it again with VR off. The camera is on a tripod and you need to turn the VR off.

 

[epp_b]

But VR was on.

That'll do it. VR and tripods compete against eachother. You should only ever have VR on when you need it.