Actually, I may be talking a load of nonesense here. What is the general opinion regarding dust in lenses - am I right that it gets slowly sucked in over the years through pressure difference??
For Pentax prime lenses, the dust got suck in from the rear of the lens from the aperture opening. How much depends on the lenses. Some suck a lot faster than others. With zooms, they get in from the zoom rings too.
Alan Chan http://www.pbase.com/wlachan
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