Pete D wrote:

Yes, well the Pentax system works for normal everyday sort of dust that I
have so far encountered. Not sure that they work when the test is not real
life, saw one where they left the sensor exposed for long periods to get
them "nice and dusty", hardly real world stuff.

Since there is no real dust problem in the real world that
could be fixed by a dust shaker, there is no need to
introduce them except for some nervous marketing dudes.

And since dust shakers are mostly marketing ploys, it does not
matter how well they work, as long as they are on the feature list.

-Wolfgang