liningiv
Second Officer
Flight distance : 329409 ft
United Kingdom
Offline
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This is not dust on the filter, it would be too blurred to register on the sensor.
It could be dust on the sensor, but if only 2 or 3 pixels wide are involved then the dust is microscopic. Less than 1/4000 inch. And the camera is sealed anyway.
I think you have either stuck pixels or dead pixels.
Take a picture in .dng of a piece of white card then examine at 100%.Dont use .jpeg as this will apply sharpening automatically and the spots will become unclear.
If the pixel is dead it will show black, if it is a stuck pixel it will be red or green or blue.
If it does not show up using white card then try black card and again examine.
Very easy to edit these specks though using clone stamp tool, in Photoshop or Aperture etc. I have to use it with my DSLR shots if there is dust on the sensor, but the dust spots are normally about 10 to 20 pixels wide/long. Dust on the lens or a filter never shows up, unless taken virtually into a strong light or oblique to the light. I would advise against trying to remove the filter and cleaning the lens, it is multicoated and quite easily scratched.
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