Individual RGB Lines

[astro mick]

This is just a sample of 6x600 secs with my 1100D camera at ISO 400.

To-wards the top you can see 3 seperate lines in RGB colour.

I took these in APT and is the first time i have seem them.

Any ideas what is causing this.

Cheers.

Mick.

[michael.h.f.wilkinson]

This kind of pattern noise is frequently seen in DSLR chips, especially when the temperature is high, and dark current is stronger. You have stretched the background quite a bit (hence the noise) so they pop out strongly. I would guess darks and flats, and dithering would remove them

[astro mick]

8 minutes ago, michael.h.f.wilkinson said:

This kind of pattern noise is frequently seen in DSLR chips, especially when the temperature is high, and dark current is stronger. You have stretched the background quite a bit (hence the noise) so they pop out strongly. I would guess darks and flats, and dithering would remove them

Thanks Michael,i did not take calibration frames,and the chip temp was 21c.

Appreciate this.

Mick.

[michael.h.f.wilkinson]

3 minutes ago, astro mick said:

Thanks Michael,i did not take calibration frames,and the chip temp was 21c.

Appreciate this.

Mick.

Darks don't always calibrate the pattern noise fully, but they do reduce it well. I also find that when combining data from different sessions, where the camera is tilted at a slightly different angle, the stripey appearance is reduced very effectively (more data so less stretching also adds to this effect)