Thank you for comments, Cam and Kevin.
I am having some issues that are boring me:
a) my coma corrector is prouducing reflex because of use of OAG and Filter Wheel. As you can see in the photo 3 it is with more 13 mm than the recommended. And I can not reduce this distance without cut the body of Canon.
Ok, I can process the round black reflex, but it will reduce the details inside the area if they exists.
photo 2: the reflex
photo 3: my set of equipment
b) the file Halfa is with much granulation. Binned or not binned is the same. I can process and smooth, but with this I loose details. If the nebula hasn't details... no problem, but if there are some one they loose the sharp appearance.
I am using dark file in DSS, and the granulation isn't from noise sensor. They are many white dot.
I will try with minor ISO, since the experience with 3200 didn't result bether and smooth images.
My last try was with Gabriela Mistral nebula. And there was benefits. The nebula was very faint in normal RGB images. The file with alfa information helped to show the nebula.
I'm using as reference the imagem in:
http://www.martinpughastrophotograph...NGC3324MPL.jpg
GSO 305mm - Canon T3 - RGB: skyglow filter, ISO 800, 10 x 240 sec / Halfa: ISO 1600, 10 x 300 sec
http://www.astrobin.com/97701/0/
note: up now, I'am not using stars mask, yet. It will very important to don't let the faint stars inside nebula with the same color of nebula
Wow! I forgot. The photo 4 is Gabriela in close up !