"water spots" in large areas of a single color

When a large area of sky is in a photograph, I see what appear to be waterspots in the area, but the glass is clean. Is this a sensor problem? It happened with my previous Canon DSLR as well. I use the 100-400L lens on a 60D. Thanks.

zedvictor1 wrote:
I should add, I think, that the spots aren't specs but are quite large and transparent--more like round smudges. I clean them up later with a clone tool, but this is less than ideal.
In principle, it could be lens flare spots, but those are pretty distinctive and not very repeatable, since they depend on the angle of the incident light. They could be actual water spots if the sensor was ever exposed to rain. A few years ago there was a particular Nikon DSLR that had a problem with oil spots; the mirror mechanism was over-lubricated and threw oil droplets onto the sensor. But I've never heard of that happening on a Canon. If a professional sensor cleaning doesn't cure the problem, it would probably be wise to send it to a Canon shop. They're not cheap (unless you're a CPS member), but they do a good job.
Bob
Boston, Massachusetts USA

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