question about IS with the 90-280

[anickpick]

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After working only with M lenses for many years, the 90-280 is a new and exciting experience to me.

I am surprised that this lens matches the M primes in terms of image quality.

 

However, when using the lens handheld, I realized that my pictures are

- very consistently sharp with shutter speeds of 1/250th of a sec. and faster (no surprise there)

- very consistently sharp with shutter speeds  of 1/30th of a second (wow!)

- but not consistently sharp with shutter Speeds around 125th of a second: I would say about 50% of my photos are slightly blurred.

 

At shutter speeds around 125th of a second, IS does not seem to have a real impact.

 

Could it be that IS needs very slow shutter speeds to fully work its Magic?

 

Anyone have the same experience?

 

Thanks, Eric