Very interesting test, I am interested in how you activated the IS and just
wonder if you waited the 1/2 second for the activation after depressing the
shutter release. I have done this same test with my 600 F4 and 100-400 and
found no vibration to the image just the camera I am using a gitzo 410
tripod and a arca ballhead so there is quite a bit of mass anyway. I have
never done this with my 28-135 since it is not a two stage IS like the newer
designs another thing I have notice about my 28-135 is that the IS produces
a higher noisy level than any of my newer designed lens's.
Jess Lee
http://www.JessLeePhotos.com
http://YellowstoneNationalPark.tv
Subject: RE: EOS tripod-compatible IS lenses
>
> 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.
>
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