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Thank you Justin and LightningNZ
Justin, up to now, I don't know why of that line. AC/DC power converter were discarded, and I am sure that Live view wasn't active.
About temperature: I never have notice of temperatur higher than 35 Celcius from BackyardEOS.
With original photos you can't see the line. It only appears when stacked and with intense enhancing in HDR curves. If I have good signals ... it isn't problem.
LightningNZ, the blemishes were on external surface of coma corrector. I have some ones,faint, over sensor, yet. They are in upper border of the sensor, near both vertice. They aren't great problem, since those area is worse area of coma and they only appear when I use strong manipulation of HDR curve.
I will try clean them in the next cleanner operation of sensor.
As Kevin suggests, I will try the ferrite. if it fails... I will forget for a while. That black line doesn't kill my photos.
The dark and flat files don't erase or hide the black line. Perhaps the problem is with electronic card or transmission over USB.
Canon is Canon. We use it to astrophotography, but they aren't astrophotograpic cameras. Faint signal always will be problem.
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