Interesting bit of blue nebulosity there Tim.
Maybe a bit of star bloating and an unusual bit of star trailing. Do you use an IR filter or is there one in the imaging train? I check each sub with digital development set way high and if you check your subs you might find just one to eliminate that has star trailing - some mount settling issue maybe - bit of RA and DEC?
Or a big snake went past and bumped the tripod?
Puzzled, I am.
GlennB
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