I got a factory refurbished Nikon 70-300 mm VR lens a few days ago. At 300 mm the effect of vibration reduction (VR) is clearly visible in the viewfinder. The image becomes stable a second or so after I half-press the shutter button. A few seconds later it becomes unstable again though. (VR doesn't switch off when it becomes unstable, I don't hear the click.)
Is this normal behaviour (i.e. that VR only works for a few seconds)? Is it possible that it's because of my arm getting tired or the wind moving the house slightly, I'm just not noticing it? Most importantly, what is the best objective way to test that VR is working as it should, so I can use the warranty before it expires (if necessary)?
Here are two sample videos, both taken handhold, while supporting my elbows on a railing. The Active-Normal switch was set to Normal.
If you want to prevent the videos from playing in a plugin (e.g. slow internet), right click the link, then choose Save As...
I'd appreciate if someone who has the same lens could comment.
- Sample video With Active mode (53 MB, looks the same as Normal mode, stable until ~12 s, then shaky)
I found a thread about a similar problem here. There isn't really a conclusion there.