|
Phil,
They look like classic dust motes to me.
I notice in your image there is also an uneven background, i.e. the top right portion is brighter than the left-side.
Perhaps you should read the How-To article on Darks and Flats. There is a technique in there that will allow you to calculate the distance of the specks from the chip.
By eyeballing, I would guess that they aren't on the chip as they are slightly defocused, but judging by their size they are closer to the lens than any internal lens surface. That leaves whatever optical surfaces are in-between the lens and the chip. i.e. the IR filter.
It may not be dust, but could be blemishes/spots in the IR filters coatings. Either way taking and applying flats to your images would remove the uneven background and the spots from your images.
|