Mike maybe your star alignment is off.
On Jun 11, 2019, at 5:00 PM, Michael McDonald <mikemac@xxxxxxxxxxx> wrote:
The “holes” might eb easier to explain. All of the stars that exhibit a hole
in one or more channels also lie in the border region that is not covered by
all of the subs. As the night progressed and with a Meridian flip in the
middle, my image slowly drifted to the bottom left corner. So some regions
are only covered by half of the subs and lie outside the rest of them. Off
hand, I can’t think of how you combine a bunch of really bright star centers
with a bunch of outside the frame values to get 0. Especially since the not
quite so bright edges of the star plus the values outside the frame does give
something.
I don’t see any “holes” in any of the subs, nor any weird artifact in the
flats.
But the “crud” pixels are never outside the frame. So something different is
happening there. Could it be from the coma effecting different color
components differently?
Mike McDonald
mikemac@xxxxxxxxxxx
On Jun 11, 2019, at 4:46 PM, Michael McDonald <mikemac@xxxxxxxxxxx> wrote:
I’m also getting holes in some of my stars! Sometimes it’s just one filter,
sometimes all three:
http://www.mikemac.com/Astrophotos/black-star.png ;
<http://www.mikemac.com/Astrophotos/black-star.png>
Something is definitely not right!
Mike McDonald
mikemac@xxxxxxxxxxx
On Jun 11, 2019, at 4:32 PM, Jim Sellers <jsellersaz@xxxxxxxxx> wrote:
Michael,
Consider processing your subs using other applications to see if ‘fungus’
remains among us? Perhaps that will tell you if it’s software or something
in your optics.
-Jim
Sent from my iPhone
On Jun 11, 2019, at 4:23 PM, Michael McDonald <mikemac@xxxxxxxxxxx> wrote:
The other night, I was imaging the Trifid Nebula. When I processed the
subs in PixInsight, a bunch of the stars had this crud on them:
http://www.mikemac.com/Astrophotos/fungus-eating-stars.png
Anyone have any idea of what weird processing error on my part is causing
mess?
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