[multiweb (Marc)]

Originally Posted by alpal

I managed to fix my camera as per here:
http://www.iceinspace.com.au/forum/s...d.php?t=130615


although there was still a faint line as per here:
"It's much better - I had to really stretch it with HDR toning to see any black line.
See the pic of Alpha Centauri."

http://www.iceinspace.com.au/forum/a...e.php?a=179281


If I was prepared to make super fine adjustments with the external potentiometer
that I installed to replace R27
then I'm sure I could get it perfect.
As per this pic:

ha yes... I remember now. It's been a while.

Originally Posted by Bart

Thanks everyone, I appreciate the thoughts. I really like the qhy9, it has served me well. The bright streaks are becoming more obvious as the camera ages. It really ruins a good image. Allan has explained the fix well.

Yes I do get column defects as it ages. I have one obvious and one in the making. They seem to start from hot pixels. I guess cosmic rays get the better of the sensor after a while. It's not a show stopper though. You can use a bad pixel map and dither. I remember an old STL11k peppered in bad columns and dark subtraction took care of all that.