I've just got my 28-135mm IS and tried the IS on a tripod. My tripod
is the best Walmart Velbon you can get :(

The first thing I noticed is that when I hit the tripod leg you can see
the vibration even when the IS is activated. This tells me that the IS can't
overcome the higher frequency vibration that come from being on a tripod.

When you hand hold your, hand moves at a much lower frequency and can keep up.


Make sense ?
Just my theory. Try it out.

-jim


> ___________________________________________________________________
> 
> Well, I have used my 28-135mm IS lens with IS on and on a tripod at slower
> shutter speeds and taken photos of artwork for a client.  It works!!!
> Sometimes, you can't believe everything you read.  I mean, what is the
> difference if you were holding the lens rock solid in you r hands (leaning
> on something for stability) and putting the lens on a tripod?  Nothing!!
> The lens does cannot determine the difference.
> 
> Peter K
> 

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