Originally posted by madison_wi_gal ... I want ONE lens on during the day, if it is dusty and windy and I can't duck out of the wind I can't afford to swap lenses and worry about gerb getting onto the sensor.
I can't really relate to this point. I carry a bag of primes(a dozen typically) and swap lenses continuously while outdoors in the wind, sea spray, pollen, you name it. Why have a DSLR with replaceable lens if you don't want to change your lens? If there is extraordinary wind and airborne dust, I change the lens inside the compartment of my sling bag(or shielded by your jacket), which is a good technique to know.
A rocket blower cleans the dust off the sensor just fine, IMO.