Generally this was on of the moust difficult object to shot in longer focal lenght. Surface brightness is very low and there is extremely faint nebulosity around a main object. I wanted to show it and a detailed filaments of the supernova remnant main body. The actual remnant is much large, than my limited field of view can show.



Exposures:

-H-alpha 8x1200s binned 1x1

-S-II 4x600s binned 2x2

-O-III 5x600s binned 2x2

Optics: Tokina 300mm TX f2.8 @ f2.8

Camera: QHY9 @ -50 C

Guiding: Lx200 GPS 12" + LQHY5 and PHD-Guiding



I think, this was as hard object as a Sh2-240 (Simeis 147), Supernova remnant in Taurus. I shot it in last Spring season; http://astroanarchy.blogspot.com/2009/01/sh2-240-more-lights.html



I found out, that color, in my older wide field image, is very usable for this new closeup version! There is not much details in very dim O-III and S-II channels- I use a method of mine, Tone Mapping, to make a color composition from images with a very different scale. It works just fine!