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So sorry I typed that too fast.  I meant to say : 1. I almost always use lens hoods 2. I never use filters. I can't think if a time being exposed to a magnetic feild, but these cameras have been through a lot.  Can you think of a real world example o...

I am not using any filters.

Thanks for the response. I do manually clean my sensors and have never noticed anything visible. I shoot with two cameras (same bodies) and only one body is doing this. I have not noticed it an any indoor photos, even the underexposed ones. I am not ...

1. I am almost always using a filter (in these examples I know was) 2.  I never use filters attached to my lenses.

Thanks for the response.  What about this example..?  More subtle, but the effect is popping up seemingly randomly (commonly on underexposed photos) and on various lenses.