New: Canon 50-200 L

Started Mar 28, 2010 | Discussions thread
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Skip M Veteran Member • Posts: 7,174
Re: Technically correct

D702010 wrote:

I dont know where the bad rep from push pull comes from.

Because you can feel the 100-400 pump air past the rear seals. If it can pump, it can suck. If it can suck air, it can suck dust. That air's gotta be coming from somewhere, and it probably has dust suspended in it, to one degree or another.

I can't feel my 24-70 pump air, but that's probably because the movement is less abrupt.
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Skip M
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