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Wasn't devoid of stars... was doing Orion, Carina... testing out my new focal reducer, which I thought was the problem at first. Took it out of the optic train, and still got a similar effect, which is why I was thinking collimation.
The flame and the horse are the faintest objects I have tried to image so far... so it seems that fainter nebula near a brighter star is problematic.
Any tips on reducing the effect? Other than the one given... moving the image in the scope a bit. Can it be dealt with, even a little, at the Photoshop stage?
Geoff.
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