Personally, I think it is because IS can screw up your composition.
Have you ever noticed that sometimes, even handheld, the IS system will
cause the image to "migrate" around the viewfinder, that is, to move to
the left or right or somewhere, and then it sort of stays there. Well,
if you had your composition all staked out with the lens on the tripod
while IS wasn't active, then you pushed the shutter button part way to
meter and the IS system kicks in and the composition goes a few degrees
sideways, I'd be a bit annoyed. Even worse, if you are taking a series
of pics, it could migrate to different areas in each pic. This could
also be the reason they disable it with mirror lockup, because then you
really can't see the difference.
This is the only thing that makes sense to me, because every shot I have
taken tripod mounted with IS has been sharp.
Any thoughts?
Mike
Ken Durling wrote:
>
> OK, I have to confess it does not make any sense to me that Image
> Stabilized lenses would get "confused" by a tripod. Because they're
> not being asked to do anything?? Sounds like a rather bad design to
> me. Autopilots, also gyroscopically stabilized, aren't confused by
> straight and level flight. They just purr along. I think the IS
> l/tripod incompatability issue is simply whether the lens has a tripod
> mount or not.
>
> That's my story and ahm stickin' to it. :-)
>
> But seriously if there *is* a problem, I'd like to hear it clearly
> explained, because I'm saving up for a couple of IS lenses! (100-400,
> and maybe 28-135).
>
> Ken
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