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Update:
I made in an indoor test of the results using an Antares guide scope attached to the QHY9.
Luckily my old Starshoot auto guider had exactly the right threads &
T piece - M42/0.75 - to screw on to the QHY9 so I used that.
It focused on to the target which was only 2 meters away
& I used my trusty tripod to center the target.
For an artificial star I tried many variants but the best ended up
some aluminum foil over a LED lamp.
There were already tiny holes in the old aluminum foil so I didn't need to make any.
I also tried many different exposure lengths.
The bright "stars" all exceed the well depth.
I was unable to see any black tails on my artificial stars
on any of the frames I took no matter what processing I used
& if the camera was warm or cold.
I know that's not very scientific because I didn't test the camera this way
before I adjusted it.
The only true way to test this is under real stars.
Actually the "black tails" are hard to see from RAW frames.
They come out mostly after heavy stretching & processing.
cheers
Allan
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