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I have used my Acratech in a variety of outdoor conditions, although admittedly not in Afghanistan or Pakistan, but including rain, snow, forest duff and trail dust, beach spray, high and low humidity, etc. It hasn't needed ANY cleaning. One of they keys of the design is that it doesn't collect detritus in the first place; anything that lands on the exposed ball is unlikely to stay or get jammed into the friction apparatus, unlike a conventional ballhead which, once dirt is able to enter, will tend to retain it. This is one claimed benefit of the Acratech approach that I have found to be unequivocally valid.
The gimbal works fine for me, and would for anyone who is not 1) very serious about gimbal-enable photography and 2) using lenses bigger than a 100-400. I'm not under any illusions that it is equivalent to a true gimbal, but for my occasional use it works, and doesn't constrain me to having ONLY a gimbal when in the field.
Dave
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