Thanks for your help- I'll look into that. As for cleaning the sensor I have never done any thing but use the camera's cleaning program - gotta get my nerve up to do that "puff of air" cleaning.
After posting this reply I went to Google and researched the cleaning process for my Canon T3i - then went to Amazon and ordered this cleaning kit - thanks for you help'
CHG_CANON wrote:
Harvey, I circled the worst spots, but you should look at the image at 100% and address all the various circle-shaped spots. You can continue to clean-up images after the capture. But, you actually should clean the sensor, both with manual execution of the sensor clean by the camera and blowing with a Giottos Rocket-Air.