Dave,Thanks for your post and comments. Some of my latest images I shot at f22, but for the most part I do usually shoot at f16-f18, and sometimes at f11.I was using on this trip for all shots my new 18-300mm and did zoom in and out a lot, so perhaps that could have caused the dust.A question on cleaning, do you do your own sensor cleaning or have it done at a local camera store?
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