I think this is my first post here, usually I'm much more active over on the Steadicam forum.
Recently, I have encountered a weird issue with my Nikon 24-120 f4 zoom, and am hoping someone
can shed some light on this: pulling focus causes the image to shift left and right, up and down,
abruptly and -I think- randomly. This is definitely not what would usually qualify as breathing.
I have isolated all other causes like pushing the lens itself around a bit, it is definitely just due to turning
the focus ring. The faster it's turned, the worse the shifting, but even on very slow pulls it shifts at some
Usually I'm not a big Fan of stills lenses, but for a recent documentary shot, it seemed like this
was a good allrounder on my BMCC, and it's a really nice and sharp lens overall. Now, of course I'm
used to this kind of shift happening when changing focal length of a stills zoom, which is why it's totally
unuseable in shot and I really use it as a "variable" prime, but while pulling focus?
Has anyone ever encountered something similar, Is this possibly due to a loose element in the lens,
i.e. might it need repair, or is that just the way it is with some stills lenses?
Thanks and all the best