PHOTO OF THE WEEK, Crescent Nebula- wide field

As promised a few weeks ago, I finally came up with a decent wide field
image of the Crescent after getting a Hydrogen Alpha filter.

I would be most interested in comments on the smudge left of center on this
image.  All the images in the lum stack have it as does an image taken by
Dennis Persyk also taken with an HA filter.  However, I don't seem to see it
on other images on the web or in previous images I have taken.

js

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