Very nice image of this faint region, Jon!
Quote:
Originally Posted by Geochron
The stars look a little dodgy towards the margins but this seems like an unavoidable trade-off when using camera lenses which were likely originally never intended for astrophotography.
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I wonder whether you need some extra backfocus given the filter in the optical path (usually 1/3 of the filter difference), especially if you are running the lens at a pretty fast f-ratio? Perhaps you've already allowed for this, but I remember my first test image with the Samyang 135, filter & astrocamera had pretty bad stars around the edge.