Hello,
This is my attemp on The Black Tower. Image in full resolution
HERE
This image was stacked as follows:
Ha: 15x 20' bin 1x1
RGB: 12x 15' bin 1x1 per channel
Bias, Darks and Flats applied
CAPTURE:
Scope: Skywatcher Esprit 120mm f/7
Mount: Skywatcher EQ-6 Pro
CCD: ST-8300M
CCD Guia: Lodestar
Processing: Pixinsight
Note about Processing: In this image I have not added Ha data to the Blue's and Green's channels, as most of the processing of the images in the web. I added only to the red channel. Before blending the Ha with the true red channel, I subtracted the Ha average luminance from the red channel average luminance, creating and index. The final Ha-red blend was a percentage of this index determined empirically.