What causes black lines across an image

[Gem]

I got three black lines across an image. All three have a star intersect them at some point. All three lines are horizontal and parallel.

What causes this? :shrug:

ps I was using an OIII filter at the time (which wasn't the cleanest I realised later...)

[A23649]

image? might be a column defect but i'm not quite sure without a pic

[allan gould]

We're you using the trial program of Nebulosity?

[Gem]

Dss

[jjjnettie]

Yes, we need a piccie so we can do the diagnosis. :)
It could be caused by a number of things.

If you wish to salvage your image, Carboni Actions has a Horizontal Banding Noise Reduction action that can tidy it up.

[Tandum]

And what was the camera/scope?

[Gem]

Here is an example.

It is in all the light frames.

[Gem]

C 9.25" f/10 SCT OTA on a CGEM

ATIK 320E

60 second images

[jjjnettie]

EEEK!!
Damn....
Could it be electrical interference???

[cventer]

Most Likely read noise.

Try a different USB cable and or port on PC/Laptop

Make sure it has a ferite core around it (one of those elongated bulbs that clamp over the cable or are moulded into it.

Another option is also to check the software. is there an option to dedicate the USB port to downloads. I give it higher priority. This is what solved some read noise I was having on my guide camera.

One last thing is check power supply. Try a different one if you can and also make sure the power supply lead has a ferie core around it as well.

[Gem]

Thanks all!

This is the only time it was happenned so far, so I am a bit puzzled. I will try again to image tonight and see if it was a one off. Otherwise, I will be trying some of the suggestions!