100-400 still a dust pump?

Started May 3, 2012 | Discussions thread
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John Sheehy
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100-400 still a dust pump?
May 3, 2012

I received my 100-400 back from Canon about a year ago, after slipping on ice hidden under snow, which made the zoom action extremely stiff. When I sent it in, I noticed that there was a lot of dust inside (it was about 2 years old). When I got it back, it was clean. I never thought about the dust again, until today, when I started to do some controlled tests with my new Canon 2x III. With a bright 400-watt-equivalent CFL right behind me, I looked in it, and no dust!

Has anyone else noticed a lack of dust in recently repaired or manufactured "dust pumps"?

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John

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