My first post ... 
After my first attempt to clean the sensor filter myself for my 7D, I took the following test photo of the blue sky at f/22, ISO 100. Still can see a few dust spots (a couple around the center and a few at the bottom). Just wondering if this is clean enough or should I clean it again? I don't want to overdo it. What do you folks think? No scratches I hope...
Your opinion is greatly appreciated! I also attach the file here. Hope it helps
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