Hello.
I started to collect information about M42 in different sessions and have problems from the beginning.
In the first session I had two sets of 15 seconds and 30 seconds at ISO 800. The first of a total of 40 images, equivalent to 10 minutes and the second 60 images, or what is the same 30 minutes. For both series they have taken 40 darks, 30 flats and 30 bias. I preprocessing each with Bach Preprocesing, and then I made the all-star lineup of the two resutantes images, to finally make the HDR integration. Ever since I came out processing such filaments are observed in virtually stretched image and not what may be the source.
I can add that when taking pictures, light files appear upright in the lights folder, while the rest of images: darks, flats and bias displayed in landscape mode. Can this be the origin of these artifacts and banding up and down image of m42?
![](http://s7.postimg.org/wwjkoq6op/M42.png)
Best regards.
Goyo