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walking noise ?
some strange artefacts in the final integrated image:
in the light is barely notable ... but not sure it's walking noise ...
Canon 60D (modded), 60sec light @800iso
@lvigano There are a lot of dark spots in your image that are caused by dust in the optical train. It looks like you are not using flats. And if you do, the flats are not correcting for the dust.
@wvreeven yep I think so ... I totally agree with you 🙂 No flat because it was just a quick test to check if it has sense or not to take a picture of M108 with a 420mm.
As soon as I can I'll redo the test with flat!
If you can dither, also do that as that will eliminate potential walking noise as well.