When I check carefully on the picture I took. I found that there are two specks of dust on my sensor. I use the Mirror Lock Up feature on my D70s and really cannot see the dust. Anyway, I use a cotton bud to swipe it several time, and take a few pictures of a white background. Seems that the dust is gone. For the pictures, I will need to use the healing tool in the Photoshop to clean it up. The tool is extremely effective in removing the two specks of dust.
Later tonight, I need to pickup my wife, therefore, no time to have practice run. I think I will have my usual Saturday morning run in the ECP tomorrow. Maybe also join the sgrunners' botantic garden run on Sunday.
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