What could cause these spots on my scanned negatives?

Question

I just had 4 rolls of film processed and scanned, and have been emailed the scans but have not seen the actual negatives yet.  The first thing I noticed is some spots in exactly the same location on each frame of the scanned image through all 4 rolls of 36 shot film.  Is this likely to have occurred in the camera, or in the scanning?
These are some sample pics I took while testing the night sky and moon that really show the issue that I am seeing. (and the bright white dot in the first two pics is actually the moon - so ignore it)

BobT · Accepted Answer

Looks like dirt on the scanner's optics. You can ask them to clean/blow the sensor and other optical elements and hope they do it...
If it were on your lens (really the only place for it to be on a film camera) the spots would change appearance with different apertures. You imply that they look the same on frames from all 4 rolls, and it's unlikely you shot all frames at the same aperture.
Edit... You said you were taking pictures of the sky and moon, so I suppose it's possible you shot them all at the same (small) aperture, but even so those spots look a little too distinct to be crud on your lens...

What could cause these spots on my scanned negatives?

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