Subexposures: 3+4+3+3 minutes for the nebula and 0.3 & 0.1 minutes for its core.

Data:
Telescope: FL=530mm, f/5, ISO400
Filter against the light pollution: IDAS-LPS-P2
Camera: Nikon d3100 unmod. in NEF (raw format)
Stretching & Histogramm of each NEF photo: Aperture (Mac)
Export in TIFF (16Bit): Aperture (Mac)
Alignment: MaximDL (2 stars manual)
Stacking: MaximDL (Media filter, default settings)
Unsharp Mask: PSE (Win)
Histogram: Aperture (Mac)
Conversion in JPG ormat: Aperture (Mac)