Ngc 5128 - 2014

[jsmoraes]

GSO 305 mm - Canon T3 - ISO 1600 - 29 x 2 min (58 min) - Skyglow filter - OAG - Coma corrector

http://www.astrobin.com/109360/0/

note: I used PHD dither, but really I didn't see a very big great advantage. Checking the photos I could perceive the dither, litle movement of stars, therefore the set was ok.

note: and the weirds horizontal black lines were there, but very smooth because of black and dark background. And I had good signals. :rolleyes:

[raymo]

Lovely, Jorge.
raymo

[BruceG]

You have got some great detail there Jorge. Excellent!

[jsmoraes]

Thank you, Bruce and Raymo. Despite of dense atmosphere with umidity, more than normal to winter seasons, there are some nights with a good sky.

[cometcatcher]

Excellent image Jorge. The dither will help hide the black lines as well as reduce dead / hot pixel noise.

[jsmoraes]

I would like this as truth, Kevin. I was analysing that line, and I saw that since 14/06/2014 I have it in CR2 file.

It seems that the problem is increasing the intensity. I only perceived it by now.

The only thing I did that can cause damange to the camera was to generate long darks to use with long exposure of H alfa. Maybe it increased the problem in the sensor.

As my last message on the topic shows, the main problem is with red channel. Little with green. And nothing with blue. Therefore it seems that it is not from any kind of obstruction, nor dust, nor damage on the glass and infrared filter or so.

It seems to be loose of intensity of information on an horizontal area of the sensor. Therefore the dither will not aid to erase or hide it.
The failure always will be there, at the same place.

I don't remember what set I was using that time (June, 2014). Now, I am using -3 of sharp, -3 of contrast , +1 saturation and zero to color tone. I was changing sharp and contrast. I will try another set to see if the presence of the line becomes more faint.