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Hello Pete,
The spots look like an insect got into your camera. I get this occasionally.
If the spots are in the same position on all of your subs then it probably isn't an insect. If there is a single spot that moves about and some subs have no spots then it probably is an insect. If it is dust on your sensor you should be able to see it (maybe with a magnifying glass).
Regards,
Tony.
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