At the end of the day, take the back off of the camera, extend the bellows to almost maximum and place on a white surface back side down and run your fingers up and down the bellows. You would be surprised how much dust and fine debris may come out. Also, load your clean film holders in zip lock bags. Carry a brush to clean lenses, film holders, etc. Be sure to dust off the back of lenses and lens boards before mounting. It helps some to tap film holders against your hand to help knock off any dust from the surface before inserting into the camera. Quick Loads are nice and avoid many dust problems. Death Valley is a wonderful place to photograph. Good luck.