Trying to get the best configuration to capture Halfa with Canon T3 not modified, I got this image with ISO 800 - 3 x 20 minutes . GSO 305 mm - Halfa filter 12 nm.
Only noise filter and curves were applied.
The third photo is a crop from original without any manipulation
I will test with subs of 25 minutes. I want more clean image and more details from the faint area
