Hi Micheal,
I know you couldn't do this for your setup the other night, but Dithering
should take care of those hot pixels, APT does support that functionality
with PHD.
James Yoder
On Sat, Oct 13, 2018 at 12:23 PM Michael McDonald <mikemac@xxxxxxxxxxx>
wrote:
Hi Paul,
I didnât intentionally dither the subframes. I donât think the Star
Adventurer has that capability. Could be the shutter going cathunk between
frames caused the Star Adventurer to skip a bit? But yeah, what you suggest
would cause the hot pixels to move relative to the stars.
Mike McDonald
mikemac@xxxxxxxxxxx
On Oct 13, 2018, at 12:13 PM, Paul Lind <pulind@xxxxx> wrote:the hot pixels actually do stay at the same location, but if the position
Michael,
I had to copy the image and blow it up to see the trails. By the way,
of the stars is dithered between frames (that is, the camera is dithered)
then stacking the subs will line up the stars and cause the hot pixels to
move. It looks like your camera dithered in a more or less straight line.
It's interesting that each trail consists of one color of dots? I haveseen this effect before, but .I'd get multi-color dots in each trail
because I dithered my monochrome camera between each color filter
exposure. Now I always attack the hot pixels themselves using Cosmetic
Correction during pre-processing. Sigma clipping is still used in
stacking, but mostly to eliminate satellite trails.
Paul
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