I have read about dust contamination inside the lens of the Canon G9 camera. Since I own a canon G9, and carry it with me frequently I decided to check; sure enough my lens is filled with all sorts of dust and lint. I was very concerned and planned to have my camera cleaned. After doing some research I found that it was a common problem and that most types of photography would not be noticeably impacted. Most types did not include macro; so I snapped some macros of a few flowers at home with my dust filled G9. I could not find any problems with the images. I'm still going to get it cleaned.
